Minoru Kagenou has been obsessed with becoming as strong as possible for as long as he can remember. He undergoes rigorous training not to gain recognition, but to blend into the crowd. By day, he pretends to be an unremarkable student. However, at night, he arms himself with a crowbar and mercilessly crushes local biker gangs. After a truck crash, Minoru believes his overwhelming powerlessness was something he couldn't overcome. In another world where magic reigns, Minoru is reborn as Cid, the second child of the noble Kagenou family. Finally, he has the power he has longed for. He dons the moniker "Shadow" and establishes Shadow Garden to fight the mysterious Cult of Diablos, an organization he envisioned. As Shadow Garden grows in size and influence, it becomes increasingly evident that the Cult of Diablos isn't entirely fictional as Cid had envisioned.