I'm Nanase Momoi, 12 years old. I'm head over heels for Hayato-kun, my neighbor who's four years older, but no matter how much makeup I put on, he still treats me like a kid. I thought mutual feelings were just a distant dream... but then I discovered this mysterious eyeshadow that makes me look like an adult only when I put it on! So I tried getting closer to him as this grown-up version of myself...