Danganronpa 1 & 2 Beautiful Days

Manga adaptation of Danganronpa 2.

Hajime Hinata, who enrolled in Hope's Peak Academy, a place where Ultimate talents gather, was excited to begin his high school life. However, he suddenly becomes dizzy and ends up on an island with 15 other "Ultimate" students... in order to escape from the island, they must kill someone and get away with it. Who kills and who gets killed? As suspicion spreads, the first murder occurs, and the Killing School Trip begins.

(Source: Amazon, translated)