It sounds like you're referring to a story involving characters named (which just means "girlfriend" in Japanese) and Yuzu Kotomi . There isn't a widely known anime, manga, or light novel by that exact title, so it may be:
If the game features multiple heroines, Yuzu’s route is often the least chosen on the first playthrough because it requires patience. The Genki Girl offers immediate excitement. The Senpai offers forbidden allure. The Imouto offers chaos. Kanojo- -- --Yuzu Kotomi
The fusion of "Yuzu" and "Kotomi" suggests a character designed to balance these traits: the bright, assertive energy of a "Yuzu" character with the delicate, genius-level vulnerability of a "Kotomi." Kanojo It sounds like you're referring to a
Hana's smile faltered. "I know."
"Yuzu?"