Call them "demis"! Vampires, dullahans, succubi, snow women. These are just a few of those beings once known as "demi-humans," and high school Biology teacher Testsuo Takahashi has always wanted to meet them. He gets his chance when the new term starts, and there are four "demis" in his school! Join the caring, bumbling Tetsuo in his quest to get to know these adorable monster girls, while helping them navigate the highs and lows of high school!