A tense rooftop confession unfolds between two men, though the reality is more complex than it appears. Souta Aoki, a gentle soul, has fallen for Mio Hashimoto, captivated by her angelic smile and kindness. However, he is crushed when she hands him an eraser engraved with another classmate's name—Ida. When Kousuke Ida notices his name on the eraser, he mistakenly assumes Aoki is the one harboring romantic feelings for him. Aoki finds himself struggling to resolve the misunderstanding alone, unable to reveal Hashimoto's true feelings for Ida. Genuine and fabricated affections intertwine as misunderstandings proliferate in this heart-pounding triangle of first loves.