Watashi ni Tenshi ga Maiorita!

私に天使が舞い降りた！

The story centers on Miyako Hoshino, a shy college student and otaku. Miyako's younger sister Hinata, who is a fifth grader, has a classmate and friend named Hana. When they meet, Miyako falls for Hana at first sight.

(Source: Anime News Network)