Circus to Kimi to Kaibutsu

A nameless, circus-loving boy, who was born with a horn growing out of his right eye, is forced to act as a "monster" in a circus as a spectacle. One day, while at the circus as usual, he meets a mysterious girl and......? This is a story of a peculiar "bond" between a "worthless" boy and a girl. [translated from Novelgame]