Mikado Shogo is an ordinary guy... YES, HE'S AN ORDINARY GUY! He is the head of the company "Mikado Group" and a real billionaire. But everything isn't that simple! Just recently he buried his father, who punished him - to become the full-fledged head of the company he must find a life partner, in other words, get married. For this Shogo goes to Miurine Academy. But if everything were that simple! Shogo learns that in childhood he was separated from his sister, and she also studies at Miurine Academy. But who is she???