In the World of High Martial Arts, the Dead Souls I Contracted Are All Aunts

[This is a story between the male protagonist and his eldest sister. There is a big age difference. Please don't enter if you don't like it. This article is more of a daily text] I am a spirit master, and I am just a freshman this year. I always look for partners who are older than me. Even the undead people I contracted were all top-notch big sisters when they were alive. No way, the aesthetics are like this. Okay, I'm going to look for the next undead that fits the aesthetic. "During the system's automatic scan, a beautiful half-length female ghost with only the waist and above was found... During the matching detection, it does not match the host's aesthetic." ...