Rumi and Naori are twins but have nothing in common, except their feelings for Jun, their next-door neighbor.

Jun and Naori go on a date to a familiar location, which gives Jun flashbacks to when he was there with Rumi.

Jun has decided not to get involved with either of them for the time being. A friend of Rumi asks Jun to help her with studying. They try to keep this a secret from Naori since she is a stunningly beautiful model.

It's time for the twins' birthday, with well wishes and gifts coming from various people, even unexpected ones!