Firefly Wedding: Everything Confirmed Ahead of the October 9 Premiere
Firefly Wedding has a release date, a full cast, two theme songs, and now a trailer built specifically around its opening theme. The manga-turned-anime, known in Japan as Hotaru no Yomeiri, is set to debut October 9, 2026, and the promotional rollout has moved fast enough over the past several weeks that it's worth gathering everything confirmed so far in one place ahead of launch.
According to Anime News Network, a new promotional video released around September 17 previews the series' opening theme, "Period," performed by iri — marking her first-ever anime theme song. It follows an earlier wave of cast and staff reveals from early August, and together the two rounds of news give a fairly complete picture of what's coming when the show actually airs.
When and where it airs
Firefly Wedding premieres October 9, 2026, airing on Fuji TV's Noitamina programming block, a Friday-night slot at 11:30 p.m. that's built a reputation over the years for hosting stylish, often darker-leaning titles aimed at an older audience than the standard late-night anime crowd. Crunchyroll will simulcast the series internationally, according to both Anime News Network and Crunchyroll's own news coverage, so viewers outside Japan won't have to wait for a delayed release window once episodes start airing.
Who's making it
David production is handling the animation, with Takahiro Kamei directing. Yūko Kakihara is credited with series composition and scripts, Yukiko Aikei is designing the characters, and NOGRID is composing the music. It's a fairly standard staff lineup for a Noitamina-block project — a single credited director paired with a dedicated series composition writer rather than a committee approach — and nothing about the credits list has raised questions about the production's stability so far.
The cast
Four cast members have been confirmed. Lynn voices Satoko Kirigaya, the series' female lead, opposite Kōki Uchiyama as Shinpei Gotō, the male lead. Kent Itō rounds out the principal cast as Kōtarō Ogawa, and Kenjirō Tsuda voices a character named Mitsueda. That's a reasonably experienced lineup for a new original TV project, and the casting reveal was one of the bigger pieces of the early-August announcement wave alongside the premiere date itself.
The story, for anyone catching up
Firefly Wedding follows a noblewoman with a limited time left to live due to illness who becomes the target of a mysterious assassin. Her solution is to propose marriage as a means of saving herself — and her new husband, it turns out, takes the vows he makes to her far more seriously than she may have expected going in. It's a premise that leans into both romance and thriller elements at once, pairing a ticking-clock illness plot with an assassination threat and a marriage of convenience that doesn't stay purely convenient for long.
That combination — a fragile, dying heroine, a mysterious killer stalking her, and a husband whose devotion to his wedding vows becomes a plot engine in its own right — is a fairly distinct hook even among the crowded field of romance-thriller manga adaptations, and it's easy to see why Noitamina picked it up given the block's history of favoring titles with a sharper emotional or genre edge than standard seasonal romance fare.
The theme songs
The opening theme is "Period," performed by iri, and it's her first-ever anime theme song credit. According to Anime News Network's September 17 report, the song is set for release as a single on November 18, 2026 — meaning the full track won't actually be available until more than a month after the show itself has premiered, with the September trailer serving as most viewers' first real exposure to it. The ending theme is "Yumegokochi," subtitled "Trance" in English, performed by TOOBOE.
Having a musician release their first-ever anime theme tied to a new Noitamina series is the kind of pairing the block has leaned on before — using original, buzzworthy vocalists rather than established anime-theme regulars to give a new title its own distinct musical identity. Whether "Period" carries that identity well won't really be testable until the single itself drops in November, well after the show is already airing.
What the new trailer actually shows
The September 17 promotional video is built around previewing "Period" rather than laying out new plot details, which tracks with how Anime News Network framed the report — it's a theme-song reveal video first, a story trailer second. Anitrendz, covering the same video, described it as featuring moments between the two leads alongside scenes of bloodshed, though that specific characterization comes from Anitrendz's own framing rather than being independently confirmed by Anime News Network or Crunchyroll's coverage. It's worth treating that particular read on the trailer's content as a secondary-source description rather than settled fact, even if it lines up reasonably well with a premise that mixes romance with an assassination plot.
The source material
Firefly Wedding is based on the manga by Oreko Tachibana, published by Shogakukan and serialized on the Manga ONE app — the same publisher's free vertical-scroll platform that's become a launching pad for several manga-to-anime adaptations in recent years. The series has published roughly 12 volumes as of mid-2026, and Viz Media handles the English-language edition for readers who want to get ahead of the anime or catch up on whatever the first season doesn't cover.
Neither Anime News Network nor Crunchyroll's coverage has specified how much of the manga the first season is expected to adapt, so it's not accurate to project a stopping point or a chapter range this early. What's confirmed is the source material's publisher, platform, English licensor, and roughly where the manga currently stands in print — not how the anime's pacing will line up against it.
What hasn't been confirmed
A few details have circulated around this announcement that are worth flagging as unconfirmed rather than repeating as fact. Claims of a special early screening tied to a Crunchyroll fan event haven't been verified through Anime News Network or Crunchyroll's own reporting, so that shouldn't be treated as settled. Likewise, there's no confirmed detail yet on exactly how far into the manga's roughly 12 volumes the first season intends to go, or whether a second cours or additional season is already planned. Those are the kinds of specifics that tend to surface closer to or after a premiere rather than in pre-launch promotional material, and nothing here should be read as ruling them out — just that they aren't confirmed yet.
What to watch for before October 9
With the premiere now under three weeks away, expect the rollout to keep accelerating. A longer trailer with more actual footage — rather than one built primarily around previewing the opening theme — is a reasonable thing to anticipate, along with firmer details on Crunchyroll's exact simulcast timing once the block's Friday 11:30 p.m. JST slot converts to international time zones. Additional supporting cast reveals also wouldn't be surprising, given that only four names have been confirmed so far for what's shaping up to be a fairly character-driven story. The November 18 release of iri's "Period" single will land more than a month after the show is already airing, so early episodes will likely use whatever abbreviated or instrumental version appeared in the September trailer until the full single catches up.
Bottom line
Firefly Wedding has a confirmed October 9, 2026 premiere on Fuji TV's Noitamina block, a Crunchyroll simulcast, a four-person principal cast led by Lynn and Kōki Uchiyama, and two confirmed theme songs — iri's "Period" and TOOBOE's "Yumegokochi" — with the newest trailer built specifically around previewing the opening theme ahead of its November single release. Between the illness-and-assassination premise, the Noitamina pedigree, and a first-time anime theme from iri, this is shaping up to be one of the more distinct new titles on the fall 2026 calendar, and the next few weeks should fill in whatever's still missing before it actually airs.
Expect a longer trailer with more footage, additional cast reveals, and firmer Crunchyroll simulcast timing details as the October 9 premiere approaches, along with the November 18 release of iri's opening theme single.