A female student named "Ichika" grew up in a complicated family environment. She was subjected to daily sexual abuse by her mother's remarried partner and eventually became unable to trust adults. One night, her homeroom teacher Oshima saw Ichika standing alone in the park and invited her, who was tearfully saying 'I don't want to go home,' back to his own house. "I hate adults," she thought, but her feelings began to change little by little... and eventually, the two crossed a line that should not have been crossed.
