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

Jun, Naori, and Rumi have to come to terms with their new dynamic. Jun goes to Toyoshige for advice.

Naori explains herself and her reasons to Jun and Rumi in order, leaving them baffled.

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.