Angel!

Hero is an angel apprentice who can not pass the promotion test to angels even though his lover Shirley is already an angel. The chief angel chief decided to impose the final special examination on the hero. Its contents is to go down to the Earth, do good things and earn 100 points in 6 days. If those conditions aren't met the hero will be expelled from the Heavens forever. His powers on Earth are limited to transformation into a strange stuffed animal figure. He appoints two school girls Mikoto and Makoto as his own apprentices and hurries to do the good deeds worth 100 points.

[From vndbreview]