While the Asian country was cleaning his room, a mere cardboard box ignited the past that he never wanted to relive through again.

Have you ever heard about Himitsu Academy before? Of course you haven't heard it yet, unless you are one of the Mitsus and one of the inheritors of its secrets. In the academy that full of secrets and mystery. In the academy that normal people are not allowed. How can you escape your fate, if you are destined to be one of its inheritors? Most of all... Can you keep Himitsu Academy as a secret?