I Want to Level up so Much, Miss Demon King

Ed traveled through another world for fifteen years and was unable to graduate from the Academy of the Brave. In the process of collecting medicine, he accidentally signed a life-and-death contract with the previous demon king. As the new Demon King, Ed decided—— Let's graduate from the Brave Academy first. … "Miss Demon King, what is the ability of our lineage?" "That is, modification of favorability, hypnosis, tentacles, time stopping, etc. As long as you upgrade well, these abilities will be yours sooner or later." "No problem, Miss Demon King, I really want to upgrade."