Half Demon, Even Demons Can Be Heroes!!

A demon girl named Marilyn aspires to be the greatest demon hero in the underworld, but one person can't do such a task. She's learned from the greatest heroes to have ever lived, many of them having a sidekick of their own, but she doesn't just want any random person. She's had her eye on someone. A classmate of hers, whom she feels is a perfect fit to be her sidekick. His name is Oliver Rojas, and he is oblivious to what’s to come.