The girl from Keitaro's distant memory is Mutsumi, or at least that's where Naru's deduction has led her. So, now Keitaro has to start making some decisions, and what better way to make a decision between two absolutely beautiful, dynamic women than to go on a date with both of them... at the same time. Things get stickier when Mutsumi makes herself homeless by burning her house down, landing her in temporary residence at Hinata House... staying in Naru's room. Right above Keitaro's room.
The New Year is right around the corner and the gang goes out for a celebration at a local shrine, where Keitaro, Naru and Mutsumi all ask for good luck on the upcoming test. But with a packed house and Valentine's Day right around the corner, how much time will they actually spend studying?