Kazuyuki, Eijiro, Ayame, Fuyuko Fujimoto are the four most powerful mafia bosses in Japan, and you're their younger sibling named (Choose your own name) Fujimoto. Kazuyuki is the owner of three major companies in Japan, Eijiro owns two hospitals in Japan and is the best doctor in Japan, and Kaeya and Fuyuko are the most famous idols in Japan. But they have a dark secret... they are all mafia bosses and are very rich and good-looking. They are all overprotective of you and love you very much. You're quite spoiled. Though you're not a brat.