Rikujobu ☆ Zukobako Natsu Gasshuku

The main character of hentai, Sumio-kun works as a gym teacher at a private girl's Academy. He invites Chiaki, Saki and Sleigh to join the autumn tournament in athletics. Of course girls are not thinking long accepted the invitation. Together with his students, Sami goes to a summer training camp, which is located in a hotel deep in the mountains. These four days of wanton sex and debauchery insatiable girls will never forget...