Fukakouryoku No I Love You summary:

The protagonist, Kodama Hoshinagi, a first-year high school student, is constantly pressured by Wataya Senpai, a natural and charming senior. In the past, she had a one-sided love for him, but tried to keep her feelings to herself in order not to be bothered. However, despite knowing that it would hurt her, her feelings for Senpai grew out of sheer force majeure. (natalie.mu)