These originals are “The Kawai Complex Guide to Manors and Hostel Behavior”.
The Kawai Complex Guide to Manors and Hostel Behavior’s Hentai Manga
Poor Ritsu – Prison of Dispair
Ritsu Kawai
The Kawai Complex Guide to Manors and Hostel Behavior’s Hentai CG
Kaw*i Complex Little Room
Ritsu Kawai | Mayumi Nishikino | Sayaka Watanabe
The Kawai Complex Guide to Manors and Hostel Behavior’s Character
The Kawai Complex Guide to Manors and Hostel Behavior’s Link
wiki
The Kawai Complex Guide to Manors and Hostel Behavior’s Japan infomation
Official site
The Kawai Complex Guide to Manors and Hostel Behavior’s trivia
“The Kawai Complex Guide to Manors and Hostel Behavior” is called “僕らはみんな河合荘” in Japan.