The main character, Yuugo Amano, was leading an ordinary life with his childhood friend Mia Kazura.
Another childhood friend, Sumire Shirasaki who had moved to Italy suddenly returns to Japan. His ordinary life changes drastically because of a love confession from Sumire who has long harbored feelings for him.
Although Shirasaki is his first love, his feelings become complicated by the fact that Mia has been by his side all this time. Memories of Mia and him being family flash before his eyes.
One day, while visiting Mia's room, Yuugo sees her masturbating. Surrounded by "Yuugo goods" such as dolls, pillows, and hidden photos of him, she was masturbating in a bizarre manner.
Through this he learns that Mia loves him and that she is jealous of Sumire. Mia notices Yuugo and Attacks him as he tries to runaway and pushes him on the bed.
Mia mounts him, screaming her love for Yuugo. As a result, he loses his virginity. Regardless of how it happened, he has had sex with Mia and must refuse Sumire's love confession.
Regardless of the form it takes, as long as he has had sex with Mia, he must refuse
Later, Yuugo visits Shirasaki's home and tells her that he cannot go out with her, but she, who has always had feelings for him, does not give up easily.
Sumire, who is a twisted and possessive girl threatens him with a stun gun and handcuffs him. Forcibly, Yuugo enters a physical relationship with her as well.
This inappropriate relationship is soon exposed, and a battle unfolds between the two girls for Yuugo's love!
Mia and Sumire are desperately trying to get pregnant and squeeze as much seed as possible out of him. To add to the chaos, Yuugo's senpai and student council president, Yuzuki Renge, joins the battle with her twisted love for him.
Let the battle commence!