ちとせetc.

Chitose, a spirited high school girl from Okinawa, falls head over heels for Yukito, a tourist from Tokyo, during a whirlwind summer romance. Determined not to let their connection fade into a mere memory, Chitose makes a bold decision—she transfers to a Tokyo high school to chase after him. But life in the big city isn't as simple as she imagined, especially when she discovers Yukito already has a long-term girlfriend. As Chitose navigates the ups and downs of love, friendship, and self-discovery, she learns that following her heart is both exhilarating and complicated. (Unreviewed summary by Grok 2)