Makoto is an ordinary university student. There is a swimming pool near his place, and he often goes there to swim and enjoy watching women in swimsuits. One day, he is asked to teach swimming to Marina, who can't seem to swim at all. While he touches her body, he gets erect. Marina notices it, and gives him a blowjob. When he touches her vagina, she cries out in pleasure and achieves female ejaculation. His unknown erotic ability comes into bloom! Make all the women from a university student to a married woman ejaculate with your fingers!