Tatsuya Kinoshita quit going to school because of a bully. He became a fragile shut-in (hikikomori) who might never get past the damage. The only person that gave him a reason to keep living was Hinata, a girl he knew his knew his whole life, and the only one who treated him like a true friend before and after the bullying. But she gave her heart to the bully that drove him to this life...