Seven years after graduating from ○ School, Yui, now a married woman, receives a letter from Sasaki, her homeroom teacher from ○ School. After receiving a letter from Sasaki, the teacher she admired, Yui decided to go to her alma mater with her husband. She was reunited with her girlfriend Sasaki in her classroom full of memories, but something happened that made her realize the rape incident from her student days that she had kept hidden deep in her heart. It made me remember... So