Kosuke Takahara has harbored feelings for Suzume Azumino, his childhood friend and the older of the two, for some time now—a fact complicated by their families' closeness and the sibling-like bond they've maintained since childhood. Determined to finally break free from that dynamic, he plans to confess his love during a joint family vacation. When a booking mishap leaves the group without enough rooms, Suzume surprises him by suggesting they share quarters, a proposal that leaves Kosuke questioning whether she truly sees him as anything more than a brother figure. As the two settle into their temporary arrangement, Kosuke grows increasingly anxious about his prospects—unaware that Suzume initiated the room-sharing specifically because she has harbored her own confession all along, waiting for the right moment to reveal what her heart already knows.