At an ordinary high school, he studies an ordinary boy named Ryuuto, who is so ordinary that he doesn’t have many friends, and his hobbies are really boring.
Despite this, he is a boy, and he does not stop having dreams, including some in which he coexists without fear with the most popular girls. Among them is Runa, who has a kind and happy personality but is also very beautiful.
Ryuuto’s friends share his taste in hobbies, and one day, when making a bet on their school grades, they decide that the one with the highest ones would be the loser.
Of the three, Ryuuto ends up being the best student, and as a punishment, his friends impose on him to declare his feelings to the girl he likes.
Getting nervous, Ryuuto ends up accepting that there is a girl he likes, Runa. However, there are rumors that she is a very experienced young woman and that she has dated many guys.
Despite this, Ryuuto thinks that Runa is very cute and that it would be a dream for him to be able to date her.
In order not to lose the friendship of his only friends, Ryuuto decides to confess to Runa, hoping that she will not be too cruel in rejecting him.
To his surprise, Runa reads the note that Ryuuto left in her locker and goes to look for him. After talking a little, he confesses his feelings for her, and although she has had several boyfriends before, something about his words and gestures surprises her.
And although Ryuuto was prepared to be rejected immediately, the opposite happens, and she tells Runa that she would like to go out with him and that he can immediately accompany her on the way to her place.
Ryuuto ends up dazed and even thinks it’s all a dream. Suddenly, he walks next to the prettiest girl in school, and she doesn’t hesitate to call him his boyfriend right away.
He starts listening to her and wonders if he has the right to date her; after all, he can barely talk to girls, and in an instant he has a very popular girlfriend.
They get on the train, and when they get to Runa’s stop, she asks him to accompany her to her house, and when he gets there, she tells him that her relatives are away from home and invites him to come in to her room.
Ryuuto is completely excited, but at the same time he wonders how she allowed him into her room if she barely knows him.
Runa goes beyond and, with very immature reasoning, suggests that they should get intimate so that Ryuuto doesn’t want to change her for another girl, or he gets bored of her.
Although his carnal desires are many, Ryuuto controls himself and tells her that this is not the type of relationship he wants to have with her and that he would like to get to know her better, with the hope that one day she will fall in love with him.
Somewhat confused, Runa accepts what he tells her and is happy to have him as a boyfriend. Now, they both want to start a real relationship.
(経験済みなキミと, 経験ゼロなオレが, お付き合いする話.)
