Kiznaiver

A teenage boy named Katsuhira Agata has lost most of his ability to feel pain and emotion, making him indifferent and a target for bullying. His friend Chidori Takashiro recalls a time before this change but cannot fully remember it. One day, Katsuhira, Chidori, and four others are taken and forced into the Kizuna System as "Kiznaivers." Participants in the system are linked so that any injury to one causes equal pain to the others. Designed to promote world peace, the system uses these teenagers as test subjects and scapegoats. As their fates are physically connected, the Kiznaivers must reveal their true selves to one another to succeed in the program.