Two years have passed since their fight with Yūto, Rokuro and Benio are fighting in Magano alongside Haruka, the residents of Seika Dormitory, and Mayura, who is on her first mission with them. After defeating all enemies, they quickly return for Rokuro, Benio and Mayura's first day at High School. As news of multiple cases of poisoning attracts the attention of Seigen, Rokuro, Benio and the others return to Magano, where they discover a young child lost inside and they take her back with them. With no clue about her family, Rokuro calls her "Sae", and both he and Benio decide to take care of her for now. In the next day, on the way to school, Rokuro, Benio and Mayura come across several people collapsing on the street.