Takuya returns to the countryside for summer vacation when Aoi, his childhood friend and former girlfriend, asks to come over. The real reason is that Aoi’s adult younger friend Urara has begged her to arrange a chance to meet him. Aoi cannot bring herself to tell Urara that she and Takuya used to date, so the three spend the day together and decide to stay overnight. That night, the assertive Urara slips into Takuya’s bed and confesses her feelings, making Aoi jealous even though he is her ex. The love triangle spirals into a summer threesome harem with repeated creampies.