A young Kalego Naberius' school days at Babyls Demon School do not begin as planned, as he is immediately targeted by several students who mistake him for the infamous "top dog" of Babyls. Despite having hospitalized several students, little is known about the top dog's identity aside from the fact they have dark curly hair, sport two horns, and wear a combination of the boys' and girls' uniforms—all of which also apply to Kalego. Desiring a more peaceful school life, Kalego and his friend Baramu "Balam" Shichirou resolve to uncover the true identity of this mysterious troublemaker and put an end to their reign of chaos. [Written by MAL Rewrite]