I'm The Catlords' Manservant Gn Vol 04

Yukiharu goes to the summer festival with the rest of the Izumi household, only to run smack into Lunya. And to make matters worse, Akira and Susumu suddenly go missing! After searching high and low with no success, Yukiharu is at his wit's end. Lunya offers him a helping hand, but could it be a trap...? Yen Press
(W/A) Rat Kitaguni