Risou de Otona no Koibito

One day, Shoto (20), a college student who goes about daily life without much thought, fell in love at first sight with a beautiful woman in his apartment building. However, he was disappointed when he never saw that woman again… until he realized that the plain woman with tattered glasses turns out to be her!
Now his usual routine is disrupted by this encounter… A heartwarming pure-love story between an unmotivated college student and a manga artist with low self-esteem!

(Source: Colorful, translated)