A manga adaptation, illustrated by Naoshi Arakawa, was serialized in Kodansha's Monthly Shōnen Magazine from December 2007 to April 2009 and later published in four tankōbon volumes.
While no one but the eight class representatives are in sight, they realize they cannot remember the name of the classmate that committed suicide during the school festival.
The series was written by Mizuki Tsujimura, and published by Kodansha in three volumes released from June 8, 2004, to August 6, 2004.
[6] A manga adaptation, illustrated by Naoshi Arakawa, was serialized in Monthly Shōnen Magazine from December 2007 to April 2009.
[6] Demelza from Anime UK News praised the first volume of the manga adaptation for its characters, story, and artwork, ultimately stating "it [delivered] a memorable experience".