Ryota Tachibana started a local grocery store after getting fired from the supermarket where he worked due to an erroneous order. At the mansion he visited on request, he encountered the murder of a famous painter, Shinomiya, and was dressed in a murderous robe. In front of Ryota in such a big pinch, Arisa Ayaragi, a beautiful girl dressed in Lolita clothes and calling herself a detective, appears ... A masterpiece humor mystery in which the young lady of the detective family and Ryota challenge a difficult case!