Yuuguu Settai ~Kotou no Gokuraku e Youkoso~

In an isolated island far away from the main land, there was a training facility owned by a high school. Because the janitor (Dokujima Nero from Tokubetsu Settai) had been run over and hospitalized suddenly, Ohmi Riku took over the job, for a limited time period of two weeks. His life was supposed to be calm surrounded by cute girls of the swimming club and the teacher. His life changed when he found a lot of video tapes sneakily recorded. In the video tapes, there was a scene of a man, who was probably the janitor, molesting a girl in a swimsuit. Then Riku found that the predecessor was always taking sneak pictures. At first, he looked down on him and sealed the video tapes. However, he eventually began to sympathize with the predecessor's evil spirit...

[Edited from AniDB]