A ronin girl who couldn't give up on her top-choice university attends a cram school, currently single. Though her first time was painful, she gradually awakened to the pleasures of sex with each experience, growing increasingly curious about erotic things. She regularly enjoys masturbation and has even had sex in a restroom at an unmanned train station, revealing her deeply sensual side. When given regular tea falsely claimed to contain herbs, she mysteriously became more sensitive and intensely experienced pleasure. Whether it was the placebo effect or some special power remains unclear, but her reaction exceeded all expectations.