Hina Kusunose

Hina Kusunose is a tennis player and die-hard romantic. She is convinced that she must go to the Ocean Festival with Yuuta and watch the fireworks with him and for that, it is guaranteed to bring budding romance into full blossom. Hina is also a clumsy girl and must get herself noticed among the girls who are also interested in Yuuta.
She has to work quickly, because a new girl gets introduced to Yuuta approximately every three minutes.

(Source: AniDB)