Theo Asper  

Theo's parents abandoned him, so he was raised by an elderly couple who treated him as their own child and grandchild. Unfortunately, the couple passed away before Theo became an adult. In a world where power is crucial for survival and money is necessary to live, Theo had no other options but to join a mercenary guild. Despite having no experience with sword or magic, he managed to hold back the mercenaries, but was eventually expelled from their parties. One day, while searching for a way to improve his skills, Theo stumbled upon a book about summoning demons and granting wishes. He decided to use this knowledge to summon a demon and fell in love with her at first sight.