Qingshan Li is a high school student living in poverty in Tokyo with his two younger sisters. After collapsing from overwork and regaining memories of a past life, he awakens a mysterious Life Guidance system that activates whenever he asks himself what to do. The system offers guidance on intelligence, specialties, and other skills, allowing him to rapidly master high school subjects and household chores.

Determined to improve his family's dire financial situation, he uses the system to write a campus mystery novel, leveraging his sisters as material. As he navigates school life at an elite academy in Minato Ward and balances his responsibilities at home, Qingshan Li strives to lift his sisters out of poverty while hiding the true extent of his abilities.