In this adult role-play, Rei Hanamiya recalls the day she was summoned over her son's bullying. At the time, she dismissed it as ordinary conflict and even blamed the victim. Two years earlier, mother and son had helped torment a kindergarten boy so badly that he transferred schools, yet Rei felt she had merely interfered too much in a children's quarrel. She later joins a mothers' volleyball club whose captain is the bullied boy's mother. The transfer destroyed that woman's home and split her family apart, and now she seizes the chance for revenge, using the club's male members to subject Rei to systematic humiliation and training.