Nanaka 6/17

Nanaka Kirisato, a driven 17-year-old high school student, is dedicated to her studies and future aspirations. Her life takes an unexpected turn after a heated argument with her best friend, Nenji Nagihara, a self-described delinquent, when she falls down a flight of stairs and suffers a brain injury. The accident has a profound effect on Nanaka, causing her mind to revert to that of a six-year-old. As a result, Nanaka's father and Nenji must keep her condition a secret while she navigates the challenges of regaining her maturity and living a normal life, forcing her to essentially grow up all over again.