Unfaithful days of having sex with two big breasts who are in the opposite personality, alternately cheating sex with her workplace friends

Mina, Rui, Hajime and Tokio are four good-looking young people working at a publishing company. As Mina is cheerful, optimistic, and sexually active, and Rui is serious, quiet but sulky, each of them thinks about each other, a big situation begins to move at a meeting over the magazine's "special feature on sex friends." Is love essential for sex? Or... after a reel in my heart, the conclusion I came to was whether it was a clever or a bad one...