A collaboration between the comic Rooster Fighter and the Japanese-style MMORPG Onigiri (PC & PlayStation 4) is now underway, starting March 26, 2026. Rooster Fighter is a rooster battle action comic serialized on the manga site "HERO'S Web" operated by Heroes Inc., with a TV anime adaptation scheduled to begin airing on April 5, 2026 (Sunday). As part of the collaboration, a limited original-story event called "Ikkei Tosen" is being held, and the collaboration character Keiji is appearing as a new mounted-attack character. To celebrate the event launch, several campaigns are also running, including a repost campaign offering a chance to win a handwritten autographed shikishi from Keiji's voice actor Kenta Miyake, as well as a login campaign awarding 100 gacha tickets.
For details, visit the Onigiri x Rooster Fighter special site.
Limited Rewards Await! Collaboration Event "Ikkei Tosen" Now Open
The Rooster Fighter collaboration event "Ikkei Tosen" began on March 26, 2026 (Thursday). The event starts with an encounter with Keiji, a rooster who has arrived from another world. By progressing through the event, players can obtain exclusive rewards including Keiji's crest accessory, companion Elizabeth's earring accessory, and a special skill where Keiji provides dramatic support in battle.
Event Period
- PC: After maintenance on March 26, 2026 (Thursday) through before maintenance on July 9, 2026 (Thursday)
- PS4: After maintenance on April 3, 2026 (Friday) through before maintenance on July 17, 2026 (Friday)
New Mounted-Attack Character "Keiji" Joins — "Piyoko" Also Available as an Accessory
Starting March 26, 2026 (Thursday), the new mounted-attack character Keiji is available in Onigiri. Keiji can be obtained through the "Rooster Nyankoropon" or the weekly-limited "Special Nyankoropon," or through the "Rooster Collab Pack" which guarantees Keiji as a drop. Additionally, during the collaboration period, the shoulder-riding accessory "Piyoko" can be obtained from select gacha draws. For more details, check the official site.
Mounted-Attack Character "Keiji"
The mounted-attack character Keiji features his signature powerful move "Kokekokkoh" (written 鴣鴂鶻鵁) from the original work, along with a unique fighting style where he powers himself up by eating sea urchin.
Rooster Collab Pack — Guaranteed Keiji Acquisition!
A special pack has been released that includes the "Manifestation Book – Keiji –" guaranteeing the collaboration character Keiji, along with exclusive My Room furniture, gacha tickets, and other bonus items available only through this pack.
Collab Nyankoropon & Pack Availability Period
- PC: After maintenance on March 26, 2026 (Thursday) through before maintenance on July 9, 2026 (Thursday)
- PS4: After maintenance on April 3, 2026 (Friday) through before maintenance on July 17, 2026 (Friday)
See the update details page for more information.
Autographed Shikishi Giveaway & 100 Gacha Ticket Login Campaign
Two campaigns are running to celebrate the collaboration.
Follow & Repost Campaign: Win a Handwritten Autograph from Voice Actor Kenta Miyake
A follow & repost campaign is being held for a chance to win one of three handwritten autographed shikishi from Kenta Miyake, the voice actor for Keiji.
Campaign Entry Period
March 26, 2026 (Thursday) through April 3, 2026 (Friday) 11:59 PM
Login Campaign: Receive 100 Gacha Tickets Just by Logging In!
To celebrate the collaboration, players who log in during the campaign period receive 100 gacha tickets simply for signing in.
Campaign Period
- PC: After maintenance on March 26, 2026 (Thursday) through before maintenance on July 9, 2026 (Thursday)
- PS4: After maintenance on April 3, 2026 (Friday) through before maintenance on July 17, 2026 (Friday)
About Rooster Fighter
Rooster Fighter is a rooster battle action comic currently serialized on "HERO'S Web," a manga site operated by Heroes Inc. Shortly after its web debut, the series gained massive attention across more than 50 countries, and a TV anime adaptation is set to begin airing on TOKYO MX and BS Nippon TV from April 5, 2026 (Sunday).
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