Rino is a cheerful schoolgirl who treats everyone equally. However, the neighbor has been slacking off at work due to stress, and just when the pent-up pent-up feelings are about to explode, he passes by Rino in the building and is greeted by her kindly, which makes him snap. He ends up threatening Rino, taking her to his room, restraining her, and playing with her body. Then a colleague from work joins in to check on the situation...