Ichika is a female student who grew up in a complicated family environment. She was sexually abused on a daily basis by her mother's new husband, and before she knew it, she was no longer able to trust adults. Whether he knew about her background or not, her homeroom teacher Oshima saw Ichika standing alone in a park at night and invited her to his house, crying, "I don't want to go home..." She had always thought, "I hate adults," but her feelings slowly began to change... and the two of them crossed a line that should never be crossed.