​Asa and Natsume find themselves deeply infatuated with Hajime Saisho, rendering a love triangle of passion and desires. Rather than engaging in a bitter rivalry for his affections, the two girls forge a unique agreement to divide his affection equally. However, their time together comes with an impending expiration date, as both Asa and Natsume are set to depart from Hajime’s life by the end of summer. As the sun-soaked days persist, each girl relishes in the opportunity to indulge in intimate moments with their shared love interest. Yet, with the approaching fated departure, their summer of love hangs on the precipice of bittersweet farewells.​