Tomurai no Kyouhan-sha

After his younger brother dies by suicide, Asato investigates by accessing his brother’s computer. He discovers online posts revealing the severe bullying his brother experienced. Determined to find those responsible, Asato is contacted by a person claiming to be the forum’s administrator. The caller invites him to join a "Revenge Sharing Group," where members assist each other in carrying out revenge in exchange for having their own revenge fulfilled. Seven individuals set out to enact seven acts of revenge.