Lately Kouki has felt like he was being followed whenever he went. It was as if he was possessed by a spirit. He discussed it with his childhood friend Hinata and she didn’t really take him seriously. He wondered if it really was all his imagination, but then his peaceful days began to change. Even though he was asocial and never dealt much with girls, the energetic class rep Himeno invited him to a purification ceremony and the school’s famous mysterious girl Mashiro also invited him to her club. Suddenly, he was living a new life surrounded by girls.
One day on his way home, the strange presence that he had been sensing all this time suddenly became visible before him. He planned to shake the mysterious spirit (?) Kokoro off, but she continued to follow him around.