My Next Life as a Villainess: All Routes Lead to Doom! (Manga) Vol. 7

A BROTHER BURDENED Having successfully avoided all of the doom flags, Katarina Claes is enjoying her new, peaceful life and eagerly awaiting graduation…until her brother, Keith, disappears!
When Katarina realizes that her behavior may have caused his sudden departure, she gathers her friends and embarks on a quest to bring him back!