Mairimashita! Iruma-kun Kalego Gaiden  

Mairimashita! Iruma-kun Kalego Side Story, 魔入りました！入間くん カルエゴ外伝, 魔入りました！入間くん 外伝, Mairimashita! Iruma-kun Gaiden

During his time at Babyls Demon School, Kalega Naberius does not have a smooth start as he is immediately identified as the "top dog" by several students due to his appearance. Although he has injured several students, there isn't much information about this notorious figure except that they have curly hair, two horns, and wear both boys' and girls' uniforms - traits that also match Kalega. In order to avoid any further conflicts, Kalega along with his friend Baramu "Balam" Shichirou decides to investigate and find out who this mysterious person is, with the aim of putting an end to their disruptive behavior.