あと21cm！

Shiori (20) is a college girl who doesn't have much interest in the opposite sex. She was starting to worry that she might be alone for the rest of her life. Suddenly, a gorgeously handsome young boy appeared in front of Shiori and confessed to her, "I like you!"!? Shiori's heart, which has never been moved by any man, suddenly began to beat with excitement! "I can't possibly be falling for an elementary school kid. I'll never admit it!!" A romantically-challenged college girl x a handsome elementary schoolboy in an age-gap love story! (Source: piccomics, translated)