Suzu Murooka, Satoshi Yamaie, and Kyosuke Matsue have maintained a close friendship since their preschool days. However, an accidental kiss between Suzu and Kyosuke leads Suzu to question her feelings for him. This incident also sparks suspicion in Satoshi, threatening to disrupt the long-standing dynamic of their trio. The three friends decide to take a trip to the beach, where their intertwined emotions continue to unfold.