With one week left before the final exams begin, Futaro stays up all night preparing practice tests for the quintuplets. The session goes downhill when Nino starts arguing with Miku and refuses to do the mock tests. Itsuki gets involved, causing the fight to escalate, with both Nino and Itsuki deciding to run away from home. The next day, Futaro and Miku search for Itsuki and Nino by themselves. They find Nino staying at a luxury hotel, and she refuses to leave...