(ONE-SHOT) Ruka Sarashina is a troubled but kind-hearted girl who faces an unusual situation. Every time her heart races around her boyfriend, paranormal phenomena begin to occur, and to make matters worse, only he has the ability to solve these supernatural mysteries.

Ruka Sarashina is a troubled but kind-hearted girl who faces an unusual situation. Every time her heart races around her boyfriend, paranormal phenomena begin to occur, and to make matters worse, only he has the ability to solve these supernatural mysteries.