Boyfriend and Girlfriend just wanted to play Undertale. But something inexplicable happened and they teleported to the underground universe. They started to look around and come across two monsters – Papyrus and Sans. This dangerous meeting can end up painfully for our heroes if they do not invent anything. So Boyfriend decides to take them to a music fight. Now he has to be really strong. If he dances better than these two opponents, the couple can return back home.