Dansou Shitara Mukashi Mitai ni Amaete mo Hazukashi Kunai yo ne, Onii-chan?

During the summer vacation of my second year of high school, my first love, the college girl Kaede Kisaragi, asked me for help. Iori Kisaragi, who is three years younger than me and was like a little brother to me when I lived in the countryside, will be spending the whole summer vacation in the city with us this year――. "Please just treat Iori like a brother. She even says she'll dress up like a boy while she's here." "Wait, Iori is a girl!?" When I met Iori again for the first time in three years, she clearly looked like a girl, but Iori thought she had succeeded in dressing up like a boy, and it's sweeter than I could've imagined. This is a summer youth flirtation love comedy with a childhood friend who is 100% pining for me! (Source: Lanove, translated)