Hana-Kimi For You In Full Blossom Vol 2

Hana-Kimi by Hisaya Nakajo. A Shojo manga rated Older Teen, published in English by Viz Media.

Mizuki Ashiya cuts her hair, disguises herself as a boy, and transfers to an all-boys high school in Japan to get close to Izumi Sano, the high jumper she idolizes, only to end up as his roommate. A beloved gender-bending romantic comedy.