Shirogane Mitsuki, a student at the exclusive Clanmine Private Academy, is haunted by a recurring dream where he is protected by an elder brother he never had.
The Academy operates under a strict uniform-based hierarchy system, and there is an elusive clock tower that no one has ever entered. Plus, Mitsuki's dream also features a non-existent elder brother.
As the truth uncovers itself, Mitsuki embarks on a perilous journey, full of fate-defying adventures.