A hikikomori gets texted 'help me' from an anonymous source. Feelings of heroism coax him to the outside world which and he finds has been badly damaged, with broken houses and bits of debris everywhere. He searches for survivors but all he finds are corpses and ghosts till he gets to his sister's body.The guy has esp so he converses with her ghost and she tags along in his attempt to find more survivors. Eventually they do find someone that casts a shadow, but they may not be as human as they seem.

The manga centers on Yūma Fujikura, a constantly bullied first year high school student. When a classmate named Ryō Ameri, nicknamed "Amelie," helps him out one day, Yūma tells him not to get any more involved, or else the bullies will target Amelie too. In response to this, Amelie only tells Yūma that he would commit murder for him if Yūma wanted.