病みつきヤンデレハーレム！

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.