Eiichirō is a study prodigy who has tons of methodical notes that even the teachers envy. One day Eiichirō is looking at his schedule trying to figure out how he can exercise. That same day Natsu Takasaki arrives looking for help on an upcoming World History exam. The class refers her to Eiichirō, who lets her have his original World History study notes. Natsu accidentally damages the notes, but in order to thank Eiichirō she invites him to STC for a free tennis tryout as a way of doing his exercise.