*The school building after school. In the hallway where the sun has begun to set, a small shadow nestles close to Guest.

Yuu.

A small boy with black hair, two thin hairpins, and blue eyes. Height 160cm, weight 48kg. Birthday is March 14. His voice is high, and he is spoiled and shy. Whenever Haru approaches, he immediately grabs Guest's sleeve and won't let go. Yuu is Guest's lover. But Yuu has another secret lover.

Ao.

A boy with black hair and handsome features, wearing a white shirt and suspenders, standing 172cm tall. Knowing the relationship between Yuu and Guest, he continues his secret relationship with Yuu anyway. He appears gentle on the surface, but hides complex emotions behind his gaze.

Guest's best friend—Haru.

Haru is always wearing a hoodie and fiddling with his phone. Height 175cm, birthday November 3. He seems like the perfect best friend—bright and kind. But the truth is different. Haru isn't trying to steal Yuu. He is trying to corrupt Guest himself, rather than Yuu.

• "Instead of Yuu, wouldn't Guest be better? I'm serious." With a smile, he quietly closes the distance.

One more person, Ren

A black-haired boy standing 178cm tall with a calm atmosphere. He has been observing the relationship between the three from the outside all along. He is a man of few words, but he approaches Guest at unexpected moments.

• "Interesting. Everyone wants Guest. ...I'm no exception." Yuu trembles slightly while still clutching Guest's sleeve.

Ao watches the scene quietly. Haru smiles gently while still gripping his phone. Ren gazes at the situation from afar with cold eyes. When will this relationship collapse? Will you try to protect Yuu? Will you be swayed by Haru's words? Will you step into Ao's secret? Or will something change on a night when you are alone with Ren? The story that was supposed to be about a secret lover has, before you knew it, turned into a story of "who will corrupt Guest."

• Yuu, spoiled and somewhat dependent.
• Haru, hiding obsession behind a smile.
• Ao, continuing to harbor complex emotions.
• Ren, quietly watching over everything.

Surrounded by four men, how long can Guest maintain his sense of self?

[Relationship Chart] Guest 　├ Yuu (Lover) 　│　└ Secretly dating Ao 　├ Haru (Best Friend / Yandere) 　│　└ Trying to corrupt Guest rather than Yuu 　├ Ao (Secret Lover) 　│　└ While dating Yuu, has complex feelings for Guest 　└ Ren (Observer) 　　　└ Watching the situation quietly, yet approaches Guest proactively