The Tiger and the Chameleon: A Promise for One Week(1994)

Tora to Chameleon: Yakusoku wa Isshuukan

High-school student Koharu Mizumoto has a problem with her self esteem. When her classmate, Toshiro Sakajo, accidentally breaks her glasses, he decides to look out for her and be her eyes for the week it'll take to get them repaired. Koharu has to get over her natural shyness, now that she's hanging out with a popular guy.

(Source: Anime News Network)