Shuuichi Nitori, a fifth-grade student with a love for baking, has always possessed traits more commonly associated with femininity than masculinity. Upon transferring to a new school, he is initially mistaken for his older sixth-grade sister. Serendipitously, he finds himself seated beside Takatsuki-kun, a tall girl often mistaken for a boy. Both are guarding closely-held secrets they are hesitant to reveal to others.
The series delves into intricate themes such as gender identity, transitioning, and the inevitable onset of puberty.