After her family's financial downfall, Youko Nishikawa grapples with shedding her princess façade to connect with peers at her new all-girls school. In a serendipitous encounter with the lively transfer student Futaba Odagiri and the seemingly sweet yet blunt Teru Hayama during a solitary forest meal, the trio, all sharing the 'leaf' kanji in their names, forge an unusual bond. Through the whimsical lens of high school life, Sansha Sanyou follows the delightful escapades of these three distinct friends navigating the trials of adolescence with humor and heart.