(Y/n) is one of the best grim reaper in the underworld. Every grim reaper had no memories of their past but only a memory of how they died. The leader of the underworld love his/her skills. Then one day, the leader sent (y/n) to the human world, in which a state name Tokyo to rip and sent soul to their places which is either Heaven or Hell. (Y/n) agreed to it and he/she prepared his/her stuff before going there. (Ongoing)