Yuuji rode home by train after a regular working day in the store. But on this day everything was different. Next to him was the mucus living in his house, which turned into Takamia-san, his colleague who treats him badly. Due to a certain incident, his companion quarreled with a schoolgirl sitting next to Yuuji, but he allowed the situation, leaving the train with his companion. When they both find themselves at home, the monstrodia cannot restrain her anger and decides to take revenge on him with a perverted game. It turns into that very schoolgirl in a sports swimsuit and, in addition, is also bifurcated to this so that its second half turns into Tamia. Now that these two women have at the disposal of Yuuji, he cannot control his sexual attraction and is captured by the moment.