Tokyo Soft Rice King.

Reborn in modern-day Tokyo, Kuroba Akira has two firm beliefs: hard work is out of the question, and poverty is completely unacceptable. Devoid of special talents and utterly lacking the ambition to grind away at a 9-to-5, he decides that becoming a kept man is his ultimate calling in life. When immediate prospects for a wealthy benefactor fall through, Akira pivots to a brilliant, albeit shameless, long-term strategy: find promising young women with high future potential, invest in their lives, carefully cultivate their affections, and eventually cash in on their success. Armed with his unique "human investment" theory of romantic leverage, Akira sets out to master the delicate art of emotional diversification—managing favorability ratings, dodging jealous confrontations, and keeping his precarious flotilla of relationships from sinking. His grand master plan is simple: lie back, let the women do the heavy lifting, and live a life of absolute ease. But playing with the hearts of future powerhouses is a dangerous game, as a breaking news flash years later reveals—when the notorious entrepreneur and investor Akira Kuroba is finally rescued from mysterious circumstances, with several prime suspects turning out to be fiercely possessive female friends from his school days.