Mizuki Yayoi, a diligent and serious girl aiming to enter a top university, enrolls in a Tokyo cram school. However, since the girls' dormitory renovation isn't complete, she needs temporary lodging and ends up staying with her uncle. Though outwardly proper, she harbors a deep curiosity about sex. One day, she confesses to her uncle: "Uncle, can I stay here forever? If I do, I'll have sex with you every day..." Hesitant at first, he eventually embraces her with warmth, moved by her sincerity. As her innocent desires intertwine with his gentle affection, their relationship evolves into something new. A story of academic pursuit, love, and personal growth unfolds between them.