Season 1

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

Jun decides to help Shiena with her studies which drives Naori crazy. Rumi, on the other hand, seems unusually indifferent about it. However, for Naori, it's clear that she needs to keep an eye on them. So she quickly invites herself along

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.

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

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

Three friends navigate their changing dynamic as Jun seeks guidance from Toyoshige.

After breaking up with Jun, Rumi makes an unexpected demand that catches him off guard.

Rumi and Naori are twins with contrasting personalities who develop feelings for Jun, their neighbor, setting the stage for a love triangle.