Kagami Seiichiro was an unassuming and introverted high school student.

However, one day, he happens to stumble upon Karen Kamishiro, the most beautiful girl in his class, confronting debt collectors.

Seiichiro, who had been earning a fortune due to unique circumstances (and a prodigious talent for speculation), ends up taking on her debt.

Due to past experiences, Seiichiro had become deeply distrustful of others and, despite having helped her, had no intention of getting involved with Karen.

However, she barges into his solitary home, pleading, "Please, allow me to repay you!"

What's more, he ends up living with Karen's beloved younger sister, Erika Kamishiro, as well—

It's a slightly immoral romantic comedy that begins when the school's most beautiful girl and a beautiful, model-esque girl whose physique defies her middle-school age move in as live-in housekeepers to the home of a boy who lives alone, a boy who lost his family in exchange for the vast fortune he gained due to his prodigious talent.

*This work is also published on other novel submission sites (Kakuyomu, NovelUp+, etc.).