Tachikawa Tetsuya is a high school freshman who aspires to become a skilled archer, following in the footsteps of his late grandfather, Fudou. One day, a new transfer student joins his class. To everyone's surprise, the newcomer is a cute girl, contradicting rumors that it would be a boy. The student's name is Sasaki Gonzaburou, and... "she"... or perhaps "he"... well, this individual harbors some "little" secrets.