Room 303

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

Short Summary
Yukimaru and his friends investigate the Shiroyashiki as they look for their missing friends and run into the strange Room 303.

Characters in Order of Appearance

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

Trivia

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