I'm Not a Succubus! manga volume 6 features story and art by Horitomo.

FINAL VOLUME.

Karen, an energetic transfer student who calls Sakura her “master,” turns out to be a real succubus! Aspiring to be like all-too-human Sakura, Karen makes it her goal to become a “respectable succubus” who doesn't display sexual energy—is that even possible?? Meanwhile, the girls prepare for the interspecies sports festival, and the class booth, which everyone needs to work on! When the girls also hold their first on-campus slumber party, feelings finally fly in this climactic sixth volume!