Shoujo Mankai Petit Rakuen ~Seito ni Sosogu Tokunou Semen Milk~

You've begun a new job as a janitor at a ----school. The laughter of children can be heard in the air. You settle down in your new office and discover a DVD in a case. It's an introduction to two ----school students Manami and Chika. There's a hint on how to find more videos. Follow the clues and find the DVDs that show the sexual nature of what went on before ...