Hitoriga the Animation(2009)

Hitoriga the Animation is a dark anime series adapted from Tsukiyoshi Hiroki's manga. Shirakawa Sumire's day takes a sinister turn when she's assaulted on a crowded train to school. Seeking help from her teacher Kurahashi, she hopes for protection and support. Instead, her situation spirals into something far worse. The series explores how a moment of vulnerability can lead to exploitation and betrayal by those in positions of trust. With its unflinching approach to difficult subject matter, Hitoriga examines the psychological aftermath of abuse and the predatory dynamics that can emerge within institutional settings.