My Best (?) Butler Vol. 5 (Kodansha, 2021)

Tohma asks Rui to return to the Marikiri household-as an official, certified butler! Rui, overjoyed, sets her sights on passing the harsh certification exam… and, of course, she must continue to hide the fact that she's a woman or risk being disqualified outright! Hatarai-sempai's guidance and instruction is crucial to passing, but as the intimacy between them grows, so do Rui's feelings! Between Tohma, Haruki, and Hatarai, how can she choose?!