Set in the Shinigami technical school for weapon technicians, the series revolves around three pairs of two characters with each having a weapon technician and a human weapon. They try to make the latter a “Death Scythe” and thus fit for use by the Shinigami. They must collect the souls of 99 evil humans and one witch to do this.
Resonance is the first opening , performed by T.M.Revolution from episode 1-30
Papermoon is the second opening , performed by Tommy heavenly6 from episodes 31 onwards