Kurai Heya

Seitaro Hino has lived a life secluded from society, together with his mother since childhood. He easily gets ill whenever he inhales the polluted air outdoors, so he spends his days by indulging in self-studies and literature in his apartment, darkened by the boarded-up windows. One day, when his mother suddenly dies, Seitaro is forced out into society and surprisingly his respiratory disease seems to have been cured by itself.