Watashi wa Watashi no Mama, Dare ni Demo Kawareru

Tomoko and Kentaro; two are old friends. But she has a special power to copy other people's personality, voice, and memories. Of course, this is a secret between Tomoko and Kentaro. One day, they go on a school excursion. They meet various girls there and enjoy their time. He gets some liquid called monster's drop by chance along the way. According to the local legend, it's a love drug...