Nanaka 6/17

17-year-old Nanaka Kirisato takes her studies and future seriously, often clashing with her childhood friend Nenji. A fall down a staircase changes everything: she awakens with the memories and outlook of her 6-year-old self.

Her father and Nenji try to keep her condition secret so she can continue attending school. As Nanaka approaches teenage life with a child's innocence, Nenji becomes her unlikely protector and discovers a side of his old friend he thought had disappeared.