Student ``Kameda'' always hangs out with his good friend ``Hosoda.'' One day, Nanami, who he has a crush on, comes to a study session at Kameda's house with her best friend, Yui. ``Hosoda'', ``Yui'', and ``Nanami'' stay at Kameda's house under cover of the fact that their parents are away on a trip. That late night, Hosoda showed Kameda's erotic goods to two girls, which led to the incident.