C-Class Magic Student Who Thinks He is SSS-Class

The strongest man in school usually hides his true strength and acts like an ordinary student... There was a man who staked his life on such a Mousou. Sion Ichinose, an ordinary student attending Crawford Magic Academy. Sion continued to behave like an "SSS-Rank" both inside and outside the school, but his eccentric behavior eventually involved those around him...? Only his Mousou and acting are SSS-Rank! The "strongest" mistaken Hero tale of a single, crazy C-Rank magic student grandly opens here!!