On the weekend, a female teacher named Kaho invites students with poor grades to her home for extra lessons. Her husband is out of town on business, and she plans to let the students study quietly, but they start slacking off, so she goes to bed in exasperation... Then late at night, the students execute their plan to rape her, saying 'We want to grope the teacher's tits,' losing all reason in front of her massive breasts. They unleash their lust and keep raping her while holding her captive. From that point on, the tragedy of being raped day and night begins...
