Rui Yanagawa

Takumi, Mari, Masato, and many other people who work at Kikuchi Cleaning Shop are leading their daily lives as usual. One day, a customer visiting the store is suddenly killed by someone, and they need to try to find out who the murderer is.

Mari Sonoda heads to Keitaro's cleaning shop with his nephew Jotaro and meets Naoya and Masato, who have returned. Meanwhile, Smart Brain, which has become a governmental organization, has transformed into a company aiming to annihilate all Orphnoch life, and this operation is led by Kitazaki.