Shinichi Tsukui, in the prime of his youth, dedicates his summer holidays to pursuing romantic connections with females. He diligently attempts this across beaches, mountains, and cities, yet achieves limited success. As summer draws to a close, he catches sight of his neighbor Aoi Ayase changing clothes through a window. Though they knew each other since childhood, Shinichi has forgotten Aoi, causing her significant annoyance. Their shared history resurfaces amidst this incident. Aoi Ayase is not the only female with whom Shinichi may develop an intimate connection.