In the Shitsuji series:

V.1 - Shitsuji wa Daitanfuteki ni Uso o Tsuku (The Butler Boldly Lies)

V.2 - Shitsuji wa Shirokujichuu mo Ai o Sasayaku

V.3 - Shitsuji wa Mondou Muyou de Kuchibiru o Ubau

V.4 - Shitsuji wa Denkousekka de Amaku Dakishimeru

V.5 - Shitsuji wa Yuiitsu Muni no Koi ni Oboreru

V.6 - Shitsuji wa Isshin Furan ni Hada o Motomeru

V.7 - ???