Becoming Friends With The Kappa Onee-San From The River / 川で河童のお姉さんと仲良くなる話 - Original Hentai Manga by Unknown - Pururin, Free Online Hentai Manga and Doujinshi Reader
DMK - Kappa - Tnaflix.com
Kappa (by Kenpi) - Hentai doujinshi for free at HentaiLoop