Watashi ni Tenshi ga Maiorita!

The four-panel comedy manga's 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) *Note: Includes 18 extra chapters.*