by The television anime Hotaru no Yomeiri (Firefly Wedding) brings together a dramatic historical romance, a dangerous assassin, and a young noblewoman determined to fight for her future. Based on the popular manga by Oreco Tachibana, the anime has attracted attention for its intense love story and its distinctive musical themes.
The opening theme, “Period,” is performed by singer-songwriter iri, while TOOBOE sings the ending theme, “Yumegokochi” (Dreamy Feeling). Both artists have created original songs for the anime, with each track reflecting a different emotional aspect of the relationship between the main characters, Satoko Kirigaya and Shinpei Goto.
For iri, “Period” marks her first song written specifically for an anime. The track captures Satoko’s determination to keep moving forward despite the difficult circumstances surrounding her life. Meanwhile, TOOBOE’s “Yumegokochi” explores Shinpei’s complicated emotions and the changes he experiences after meeting Satoko.
The anime premiered in Japan on October 9, 2026, in Fuji TV’s Noitamina programming block. Its creditless opening and ending videos have also been released, allowing viewers to enjoy both songs alongside their animated sequences.
This article covers the complete Hotaru no Yomeiri anime theme song list, including the opening and ending tracks, the artists behind them, their comments, and the latest updates about the series.
What Is the Anime Hotaru no Yomeiri (Firefly Wedding) About?
Hotaru no Yomeiri is based on the manga written and illustrated by Oreco Tachibana, who is also known for creating Promise Cinderella.
The story takes place during the Meiji era of Japan, a period of major social and cultural change. It follows Satoko Kirigaya, the daughter of a noble family, who dreams of marrying into a prestigious household and becoming someone her father can be proud of.
Although Satoko is beautiful and comes from a wealthy family, her life is far from easy. She suffers from a serious illness, and doctors have told her that she may not have much time left to live. Because of her fragile health and her family’s expectations, she feels pressure to secure a marriage that will benefit her household.
One day, while out with her bodyguard, Satoko is kidnapped by a group of men. When she finds herself in a life-threatening situation, she encounters Shinpei Goto, a mysterious and exceptionally skilled assassin.
Desperate to survive, Satoko makes an unexpected proposal: she asks Shinpei to marry her.
At first, the proposal is simply a desperate attempt to escape danger. However, Shinpei takes her words seriously. His affection quickly becomes intense and obsessive, turning their unusual arrangement into a complicated relationship.
What begins as a marriage proposal made to save her life gradually develops into a dramatic romance filled with danger, emotional conflict, and unexpected choices.
A Romance Between a Noblewoman and an Assassin
The central appeal of Hotaru no Yomeiri lies in the contrast between its two protagonists.
Satoko is determined to make her own decisions despite the limitations imposed by her health, family expectations, and the society around her. She may appear delicate, but she has a strong will and refuses to give up easily.
Shinpei, on the other hand, is a dangerous assassin whose understanding of love is far from ordinary. His feelings for Satoko are powerful, but his possessive nature creates uncertainty about how their relationship will develop.
Their personalities create an unusual romantic dynamic. Satoko wants to protect her freedom and future, while Shinpei is determined to keep her by his side.
The story combines romance with suspense, making it more than a conventional historical love story.
Original Manga Publication
The original Hotaru no Yomeiri manga was serialized on Shogakukan’s MangaONE digital platform beginning in January 2023. The series concluded in August 2026 and was collected into 12 volumes.
Oreco Tachibana’s work gained considerable popularity, surpassing five million copies in circulation and winning the Grand Prize at the Electronic Comic Awards 2024.
The anime adaptation is produced by David Production, the studio known for popular works such as JoJo’s Bizarre Adventure and Cells at Work!.
The television series began broadcasting in Japan on October 9, 2026, at 11:30 p.m. JST on Fuji TV’s Noitamina block. It is also available through streaming services, including Crunchyroll in several international regions.
Opening Theme: “Period” by iri
Song: “Period”
Artist: iri
Theme: Opening
Anime: Hotaru no Yomeiri
Special Detail: iri’s first original anime tie-in song
The opening theme of Hotaru no Yomeiri is “Period,” performed by singer-songwriter iri.
The song was specially written for the anime and marks iri’s first time creating an original track for an anime production. Known for her distinctive blend of R&B, hip-hop, and pop influences, iri brings a modern musical style to the historical romance.
The track reflects the emotional strength of Satoko Kirigaya. Although Satoko is surrounded by difficult circumstances and a future that appears uncertain, she continues to stand on her own feet and move forward.
In her official comment, Iri explained that she was deeply moved by Satoko’s determination. Even when faced with a reality she would rather turn away from, Satoko refuses to surrender and continues to face her situation directly.
The singer also noted that 2026 marks the tenth anniversary of her major music debut. As this was an important milestone in her own career, she completed “Period” while reflecting on her current feelings and experiences.
Iri expressed her hope that viewers would enjoy the song alongside the anime.
Original Creator Oreco Tachibana Praises “Period”
The original manga creator, Oreco Tachibana, also shared a comment about the opening theme.
Tachibana described “Period” as a song that communicates the determination to keep going, refuse to give up, and reach out for something important regardless of the circumstances.
The creator explained that the song makes the emotions of the characters and the story feel more vivid. Tachibana also said that listening to the track brings warmth and makes the heart feel encouraged.
This connection between the music and Satoko’s personality is an important part of the opening theme’s appeal. Rather than simply introducing the characters, “Period” reflects the determination that drives the story forward.
Creditless Opening Video Released
The official creditless opening animation was released on October 10, 2026, shortly after the anime’s television premiere.
A creditless opening is a version of an anime’s opening sequence without staff names and production credits displayed over the animation. It allows viewers to enjoy the visuals and music without text covering the screen.
The sequence features iri’s “Period” and introduces the atmosphere of the series through its characters, imagery, and emotional tone.
The opening is particularly fitting for a story about a young woman who refuses to let her difficult circumstances decide her entire future.
Who Is iri, the Singer of the Opening Theme?
Artist: iri
Major Debut: 2016
Genre: R&B, hip-hop, pop
Known For: “Wonderland,” “Aitai wa,” and “Period”
iri is a Japanese singer-songwriter known for her smooth vocals and a musical style that combines R&B, hip-hop, pop, and dance influences.
She made her major-label debut in 2016 and gradually established herself through original music, commercial collaborations, live performances, and appearances at music festivals.
One of the distinctive features of iri’s music is the way she combines melodic singing with rhythmic phrasing. Her songs often move between relaxed vocal passages, rap-influenced sections, and dance-oriented beats.
She is also known for her understated fashion sense and cool public image, which have attracted attention in Japanese fashion and music publications.
Music Career and Collaborations
Alongside her solo releases, iri has participated in collaborations and provided music for other artists and commercial projects.
Her work includes songs for television dramas, advertising campaigns, and other entertainment productions. She has also worked with artists such as Kaela Kimura and the former group Sexy Zone, now known as timelesz.
Some of her notable tie-in projects include “Swamp,” the theme song for the Japanese drama Sky Castle, and “Faster than me,” associated with the drama Wakatte mo the shapes of love.
She has also contributed songs to campaigns and advertisements connected to brands such as Nike and JR East.
With “Period,” iri has taken an important new step by writing an original song specifically for an anime.
Popular Songs by iri
Some of iri’s well-known songs include:
- “Wonderland” – One of her popular tracks, also performed on the YouTube music channel THE FIRST TAKE. Its music video had surpassed 30 million views by October 2026.
- “Aitai wa” – A song that attracted attention through social media, including TikTok.
- “Swamp” – A drama tie-in song associated with Sky Castle.
- “Faster than me” – A theme song connected to the drama Wakatte mo the shapes of love.
- “Period” – Her first original anime tie-in song, created for Hotaru no Yomeiri.
The opening theme allows anime viewers to discover iri’s music while introducing a new audience to her distinctive sound.
Ending Theme: “Yumegokochi” (Dreamy Feeling) by TOOBOE
Song: “Yumegokochi” (夢心地)
Artist: TOOBOE
Theme: Ending
Anime: Hotaru no Yomeiri
The ending theme of Hotaru no Yomeiri is “Yumegokochi,” performed by TOOBOE.
While Iri’s opening theme focuses on Satoko’s determination, TOOBOE approaches the story from Shinpei’s emotional perspective.
The song explores the feelings that develop inside Shinpei after meeting Satoko. Although he is a skilled assassin who can survive on his own, his encounter with her changes the way he understands his life.
TOOBOE explained that he wanted to look into the depths of Shinpei’s eyes and heart and express the confusion caused by Satoko’s presence. The song reflects what Shinpei loses, what he gains, and the emotions he struggles to understand.
The artist also described the central idea behind the track as something Shinpei could not obtain by living alone, even though he was capable of surviving independently.
This makes “Yumegokochi” an important musical counterpart to the opening. It focuses less on Satoko’s determination and more on the emotional changes taking place within Shinpei.
TOOBOE’s Comment on the Anime
TOOBOE also shared his thoughts about the story itself.
He explained that if the anime’s narrative is viewed as Satoko’s life, then every element of the production exists to make her shine.
This perspective influenced the creation of “Yumegokochi.” Although the song explores Shinpei’s feelings, it remains connected to Satoko’s importance in his life.
The ending theme therefore reflects the emotional complexity of their relationship. Shinpei may appear powerful and self-sufficient, but meeting Satoko introduces feelings and experiences that he could never have discovered on his own.
Animated Music Video for “Yumegokochi”
The music video for “Yumegokochi” is an entirely animated production supervised by TOOBOE.
The video brings together a separate creative team:
- Music Video Direction and Storyboarding: MIEL
- Character Design: Mai Ohtani
- Animation Production: Qzil. la
Qzil .la is also known for its work on other animated projects, including Champignon no Majo.
The animated format suits TOOBOE’s creative style, as the artist is involved not only in music but also in illustration and video production.
By presenting the song through animation, the music video creates a visual interpretation of the emotions and atmosphere behind the track.
Creditless Ending Video Released
The official creditless ending animation was also released on October 10, 2026.
The sequence features TOOBOE’s “Yumegokochi” and provides a separate way to experience the song alongside the anime’s visual presentation.
The opening and ending videos offer two different emotional perspectives on the same relationship. “Period” introduces Satoko’s strength and determination, while “Yumegokochi” explores the changes taking place inside Shinpei.
Together, they help establish the emotional identity of Hotaru no Yomeiri.
Who Is TOOBOE, the Singer of the Ending Theme?
Artist Name: TOOBOE
Music Creator: John
Known For: “Shinzou,” “Itai no Itai no Tondeike,” and “Yumegokochi”
Music Style: Alternative pop, rock, and Vocaloid-influenced music
TOOBOE is the solo music project of Japanese music creator John.
The artist is involved in several aspects of music production, including singing, songwriting, composition, illustration, and video creation. This broad creative involvement helps TOOBOE develop a distinctive identity across music releases and animated music videos.
Before becoming active under the TOOBOE name, John began working as a Vocaloid producer in 2019. Vocaloid is a Japanese singing-synthesis technology that allows creators to produce songs using digitally generated singing voices. Hatsune Miku is one of the most recognizable virtual singers associated with this music scene.
John initially gained attention through songs created with Vocaloid software before expanding into solo performances as TOOBOE.
TOOBOE’s Major Debut and Popular Songs
TOOBOE made a major-label debut in April 2022 with the single “Shinzou” (Heart).
Since then, the artist has released several songs that have attracted attention on digital music platforms and YouTube.
One of the notable tracks is “Itai no Itai no Tondeike,” released in June 2024. Its music video became particularly popular, surpassing 34 million views by October 2026.
Another important work is “Haru Arashi,” a song featuring Hatsune Miku that has surpassed 64 million YouTube views.
TOOBOE has also provided songs to other artists, including yama and King & Prince. The track “Mahi,” provided to yama, was used as the opening theme for the anime 2.43: Seiin High School Boys Volleyball Team.
The artist has also collaborated with the music unit PUFFY. “Collage,” written and composed by TOOBOE and performed by PUFFY, served as the opening theme for The Story of a Girl Who Couldn’t Become a Magical Girl. It was released under the joint credit of PUFFY and TOOBOE.
TOOBOE’s Other Anime Theme Songs
TOOBOE has become increasingly familiar to anime viewers through several theme song projects.
Some of the artist’s notable anime-related songs include:
- “Jouzai” – Ending theme for Episode 4 of Chainsaw Man.
- “Mahi” – Opening theme for 2.43: Seiin High School Boys Volleyball Team, performed by yama.
- “Anata wa Kaibutsu” – Ending theme for The Summer Hikaru Died.
- “GUN POWDER” – Opening theme for the first season of Yuusha no Kuzu.
- “Yumegokochi” – Ending theme for Hotaru no Yomeiri.
His involvement in Hotaru no Yomeiri continues his connection with anime music while allowing him to explore a more emotionally focused story through the character of Shinpei.
Latest Hotaru no Yomeiri Updates
The anime’s musical announcements are part of a wider promotional campaign for the franchise.
Creditless Opening and Ending Animations
Following the television premiere, the official production team released creditless versions of both theme song sequences on October 10, 2026.
These videos make it easier for viewers to enjoy the animation and music separately from the broadcast episodes.
Live-Action Adaptation Announced for 2027
Another major franchise update arrived on October 10, 2026, when a live-action adaptation of Hotaru no Yomeiri was announced for 2027 on Fuji TV.
This is a separate project from the animated television series. It gives the original manga another opportunity to reach audiences through a different format.
The announcement adds to the growing attention surrounding Oreco Tachibana’s story, which has already gained a large readership through its digital manga release and collected volumes.
Further details about the live-action production, including its complete cast and broadcast schedule, should be followed through official announcements.
The music of Hotaru no Yomeiri reflects the different emotional sides of its central romance.
iri’s opening theme, “Period,” captures Satoko’s determination to face her difficult circumstances and continue moving forward. As iri’s first original anime tie-in song, it is also an important milestone in the singer’s career.
TOOBOE’s ending theme, “Yumegokochi,” offers a contrasting perspective by exploring Shinpei’s inner feelings and the emotional changes brought about by meeting Satoko.
The two songs work together to frame the story from the perspectives of its main characters. Their different musical approaches also complement the anime’s mixture of historical romance, suspense, and emotional drama.
With the creditless opening and ending videos now available and a live-action adaptation scheduled for 2027, Hotaru no Yomeiri continues to expand beyond its original manga.
For fans of anime music, iri and TOOBOE’s contributions make the series worth adding to their playlists.
