Tsuma ga Onsen de Circle Nakama no Nikubenki ni Natta no Desu ga... Anime Edition — Episode 1

Based on the adult manga by LINDA Project. The gathering with friends hanging out with new brides Ayaka and Endou, makes them tell their old stories and experiences. With a very tempting situation, and also his omission Endou make his friends immediately ambushed and sex with Ayaka in turn. (Source: Nekopoi and Has Been Translated and Edited)