Revenge Shinigami

Haise, a 17 yr old high-schooler, is relentlessly bullied at school and at home. In an attempt to take his own life Haise meets with an overly friendly Shinigami named Ganta, Ganta makes a proposal for Haise for him to rewind time by 1year , However, this time, Ganta wants the roles to be reversed. Haise is now tasked with either convincing his tormenters to kill themselves, or killing them himself.