The main character of the game named Io – a completely ordinary guy who has a small problem. He simply doesn't understand how to behave around the opposite sex. Any attempts at conversation are ruined by his perverted mind. The only person with whom he established a normal connection is his friend Lily – a monster-girl. However, until a certain point this didn't bother him.

But one day he is tasked with going to a dangerous region called Monstopia. There, the monster girls began to run wild, causing senseless pain and destruction. Have they simply gone mad, or is something greater happening? Find out together with Io!