Two classmates, "Hinata" and "Mamoru," who attend the same all-girls school, are close friends who share similar interests. However, their friendship takes an unexpected turn when Mamoru confesses her feelings through a love letter, leading them to become more aware of each other's emotions. As they navigate these new waters, their relationship evolves beyond mere friendship, and they begin to realize that they harbor deeper feelings for one another. The story unfolds as they grapple with their growing attraction and the complexities of their blossoming romance, ultimately culminating in a passionate encounter that solidifies their status as lovers.