How Could the Mighty Demon King Be the Servant of a Frail Little Girl?

[Yuri Cuddles]+ [Urban Fantasy]+ [Sickly, Warmhearted Loli x Cool, Tsundere Demon King]+ [1v1]+ [Superpowers]+ [Battles]+ [Lighthearted and Silly]+ [No Angst] Jiang Ai transmigrated to a world of high-level martial arts and Superpowers. “System, can you help me defy fate?” [You bet, Host! I can summon an awesome beast for you!] “System, then... why did you summon a mysterious big sister?!” [Uh... my mistake!] “Are you my master?” Jiang Ai looked at the female demon king before her and felt like she was about to explode. The world-ending demon king from the legends had somehow become her subordinate.