Yarichin Kateikyoushi Netori Houkoku

When middle-aged man, Tatsunobu begins to suffer from erectile dysfunction, he concludes that his alluring young wife, Akari will leave him for another man, for she has a history as an adulteress. Therefore Tatsunobu devises a plan to save his marriage, he asks his step-daughter Shizuku's tutor, Nozomu to cuckold him, so that he can control what would otherwise be inevitable. Tatsunobu adds two conditions, firstly, Nozomu ought to use contraception, secondly, he ought to send him a record of every session, so that he could one day recover from his predicament. Nozomu accepts the deal but almost immediately starts to violate Tatsunobu's conditions and also extends his debauchery to Shizuku.