Takumi Kaizu, a high school senior with dark brown hair and green eyes, maintains close friendships with several girls despite his initial lack of romantic interest. He lives with his younger stepsister, Sana Kaizu, who is not blood-related and relies on him to wake her each morning. Konami Hatano, his gentle and timid childhood friend, visits daily to prepare breakfast, underscoring their deep bond. His social circle includes Shino Ebizuka, Konami's protective and hot-tempered friend who frequently clashes with Takumi's perverted best friend, Osamu Funada. Sana's unpredictable best friend, Chiwa Amano, often makes blunt observations about inappropriate situations. Wakana Shimazu, an elegant and beautiful upperclassman harboring an unnoticed crush on Takumi, is often accompanied by her protector, Yuno Kawakami. Takumi's homeroom teacher, Hinako Nanao, exhibits eccentric spending habits on mail-order products, leading her to seek free meals in the cafeteria. Prompted by Osamu's direct question about romantic feelings, Takumi resolves to find someone he likes before summer vacation ends – his last before significant changes. He participates in typical high school activities like a school trip, the Tanabata festival, and a fireworks viewing, where memories surface of releasing lanterns with Konami. Throughout these events, he navigates decision points that influence his interactions and potential romantic paths, often displaying hesitation or passivity, such as reluctantly joining Osamu's schemes. Underlying his actions is a consistent hope that his close-knit group remains unchanged, highlighting his attachment to stability and shared memories. The story concludes without definitive romantic resolution, emphasizing his ongoing contemplation of relationships and the future.