In the Clear Moonlit Dusk Vol. 3 English version manga

Yoi Takiguchi, known as a “prince” among her peers, has embarked on an experimental dating relationship with Ichimura-sempai, the school’s elusive other “prince.” At first, Yoi intended to explore her sempai’s true feelings, but changes in her own affections have left her more and more confused. Meanwhile, Ichimura-sempai is realizing that his feelings towards Yoi may run much deeper than he’d like to admit. If all that weren’t enough, a new “prince” shows up to work at Yoi’s part-time job! What will this new development mean for the princes?!