Story
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.
Synopsis via AniList (English).
Preview
From the anime adaptation: WATATEN!: an Angel Flew Down to Me.