Assassin Restaurant

Akatsuki, a killer whose memory disappears by the next day to the aftereffects of his past injuries, spends his days respecting a fixed routine and completing requests. One day, he goes to a restaurant for an assassination request, only to fail to kill the restaurant manager Aoi who's the target. Akatsuki returns the next day, only to end up eating curry made by Aoi, which turns out to be drugged. When he comes to, Akatsuki realizes that he still remembers eating curry the next morning. In order to find out the reason why his memory disorder improved, he decides to work part-time at Aoi's store, but what is Aoi hiding...!?