I live in the countryside, but I got a job in Tokyo and moved there. I came to my relatives' house for the first time in over a decade, and I ended up staying with them while they looked for a room. I met my cousin Hikaru, who had become a high school girl, and she had become very cute and even a little devil. Contrary to her cute face, her mischievous Kokoro was awakened and her provocations escalated! Tokyo girls are amazing, they feel good, but... they're scary. Hikaru's little devilish actions take away my energy, both body and Kokoro.