嶋乃 まつり

Affiliation: Ichisakura Academy first year, Cycling Club
Belonging to Ichisakura Academy's cycling club, Matsuri is a cheerful underclassman (who's a bit of a masochist).
She, for whatever reason, blindly follows the protagonist, going to him for validation and accepting his orders with a "gladly, senpai!"
When the protagonist is in danger of being late to school, Matsuri offers him a ride on her bike. 
The protagonist likes to fondle her while she's driving him to school. It apparently makes her go faster.