One day, two childhood friends become boyfriends at the same time...! A sweet and doting childhood friend happy love comedy! Rui is an ordinary girl, and her childhood friends, Iku and Souma.

The three of them live next door to each other, their parents are friends, and they've been friends ever since they were little, even as college students. When Rui was bullied as a child, the two always protected her, and they were like older brothers to her.
Iku and Souma are incredibly popular with the girls at university, and Rui is fed up
with the constant advances they make on her.

One day, through a girl's gossip, she accidentally finds out that her two childhood friends already have girlfriends.

"We want to be together forever," they made as children, a promise that should have been long forgotten.
Not wanting to interfere with her best friends' love, Rui decides to distance herself from them. She
tries to accept an invitation from a boy from the same university, but Iku and Souma suddenly appear and stop her.

The two confront Rui as she tries to go out with a guy other than them.
When Rui tells them that she doesn't want to get in the way of their love, both Iku and Souma confess at the same time that they've only ever liked one girl since childhood.

They kept their feelings hidden, engaging in relationships with girls they weren't even interested in to vent their sexual desires, all in order to fulfill Rui's wish to stay together as friends forever.

And then...
Upon hearing that they've always loved her as a member of the opposite sex, Rui
begins to think of them as men.

Seeing Rui's unexpected reaction, Iku and Souma, who had been trying to act like "friends" as before,
suddenly change their attitude and reach out to her as "men."

And so the "friendship" between the three falls apart... The
three of them end up engaging in a suffocatingly intense, sweet, intertwined sexual encounter...

A happy love comedy about ten doting childhood friends, where two unrequited loves over a decade come true!