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

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)