Seven Knights Re:BIRTH Opens Demon Slayer Pre-Registration

Seven Knights Re:BIRTH is preparing a four-week collaboration with Demon Slayer: Kimetsu no Yaiba. The event begins on October 1, 2026 and is scheduled to continue through October 29.

Netmarble opened pre-registration on September 14, giving players time to register before the crossover update becomes available. The collaboration brings four Demon Slayer heroes into Seven Knights Re:BIRTH, adds Nezuko Kamado as a Legendary Pet and introduces collaboration battle content involving Upper Rank demons.

Players who complete collaboration pre-registration receive Demon Slayer: Kimetsu no Yaiba Summon Vouchers. These are collaboration-specific summon items intended for the Demon Slayer crossover content.

Registration is handled through the dedicated Seven Knights Re:BIRTH x Demon Slayer special page. The campaign opened on September 14 and runs ahead of the October 1 update.

The pre-registration campaign is separate from the normal login rewards that begin once the collaboration itself starts.

The crossover introduces four playable collaboration heroes across two release waves. Tanjiro Kamado and Zenitsu Agatsuma arrive first on October 1, followed by Giyu Tomioka and Shinobu Kocho on October 15.

The official collaboration page states that all four collaboration heroes can be obtained by playing during the collaboration period, although the individual acquisition routes are not identical.

Tanjiro has the clearest acquisition route announced before launch. Players can obtain him through the collaboration login event once the October 1 update goes live.

Netmarble also states that Tanjiro can be developed up to Awakening by continuing to play during the collaboration period. This makes his distribution different from a character available only through a standard summon banner.

Details for obtaining Zenitsu, Giyu and Shinobu are being released separately as the collaboration approaches, while the official special page confirms that all four heroes are part of the play-to-obtain event structure.

Nezuko Kamado joins the crossover as a Legendary Pet rather than a playable hero. Players will be able to obtain her through gameplay during the collaboration period.

This gives the event five major Demon Slayer character additions when the four playable heroes and Nezuko's pet role are counted together.

The Demon Slayer crossover also extends into combat content. Upper Rank demons appear as collaboration bosses, giving the event dedicated encounters beyond collecting its heroes and pet.

Netmarble's reveal indicates that the boss battles are being designed around the distinct characteristics of the Demon Slayer enemies involved. Full boss lineups and individual mechanics are being revealed separately through the game's official community, video and social channels.

The crossover is connected to Demon Slayer: Kimetsu no Yaiba's Infinity Castle material, which provides the setting for the announced heroes and demon encounters.

The September 14 announcement is the opening stage of the collaboration rather than the final event guide. Netmarble confirmed the four heroes, Nezuko, the pre-registration reward, the October schedule and boss content, while additional character, event and reward information is being released progressively.

For now, the main preparation step is pre-registration. The playable event begins October 1 with Tanjiro and Zenitsu, expands again on October 15 with Giyu and Shinobu, and continues through October 29.

Note: The collaboration's individual summon pools, detailed hero skills and full boss mechanics were not included in the September 14 launch announcement and are being revealed separately through official Seven Knights Re:BIRTH channels.