When Yuuya Nojima returns home from school as usual, he finds an unfamiliar woman in his room. Turns out, she is a college student who has come as a tutor through an introduction from his mother’s acquaintance. However, Yuuya, unsure of how to interact with a mature woman who is very different from his classmates, finds that his grades continue to struggle. Meanwhile, the young woman, feeling responsible for the lack of results, impulsively blurts out that she will let Yuuya touch her breasts if his grades improve on the next test. This leaves Yuuya at a loss for words, and while the young woman reconsiders the meaning of her words, Yuuya's grades miraculously improve on the next test. As a reward, the young woman removes her top, revealing her soft breasts... much, much softer than Yuuya imagined...