hey dad, what is sex? Sose-natsuru, Fuji no ina, Tsugumi MUTO

A daughter in the middle of adolescence is asked about sex by her friends at school. The daughter who returned home understands well, but asks her dad after all. "Hey dad, what is sex?" Of course, he is a surprising father, but because of his erroneousness, he thinks it would be bad for others to ask him, so he begins sex education with joy.