Judge

"What is your crime?" From the author of Doubt, it's time for a new terrible game, Judge. Hiro's brother Atsuya is dating Hiro's childhood friend and secret crush Hikari. Hiro's affection for Hikari will lead him to commit an un-punishable crime against his older brother. At least, he thinks it is un-punishable, until he is kidnapped and imprisoned by a group of people wearing animal masks. The judging is about to start!

(Source: MangaHelpers)