Junho, an ordinary office worker who is run over at work and ignored by his girlfriend, learns Jiu-Jitsu from Arum, his neighbor, at the nagging of his girlfriend. When entering the gym, in front of you, you can see female members exercising with undressed clothes, breathing wildly, and Miho, one of the members, approaches Junho with a strange gaze… “Junho~ Finally, we have only the two of us~?”