Manga

Tomodachi Game (トモダチゲーム) is a Japanese manga series written by Mikoto Yamaguchi and Illustrated by Yuuki Satou.

Plot
High school student Yuuichi Katagiri, who values friendship above all else, enjoys a fulfilling life with his close friends Shiho Sawaragi, Tenji Mikasa, Makoto Shibe, and Yutori Kokorogi. However, after a particular incident, they're dragged into a debt repayment game. The only way to beat the "Tomodachi Game" is to not doubt their friends. Bound together by solid friendships, the game should've been easy, but...

Volumes
For a full list of volumes, see Chapters and Volumes.