Room 303 (ルームサンマルサン Rūmu Sanmarusan? ) is an oneshot by Daisuke Ashihara, first published in 2008.

Short SummaryEdit

Yukimaru and his friends investigate the Shiroyashiki as they look for their missing friends and run into the strange Room 303.[1]

Long SummaryEdit

Characters in Order of AppearanceEdit

  1. Yukimaru Ichijō
  2. Asumi Amakura
  3. Takaaki Katagiri
  4. Tōichirō Momozono
  5. Karin Yuitsuka
  6. Demon
  7. Sadohara


  • The main five characters reappear in World Trigger as members of Katagiri Unit.


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