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. 
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(Source: Anime News Network)

Episode 1 - A Funny, Squirmy Feeling

Episode 2 - Incontestably Cute

Episode 3 - Imprinting

Episode 4 - Can We Talk for a Moment?

Episode 5 - Don't Worry! Leave It to Me!

Episode 6 - Mya-nee Doesn't Have Any Friends

Episode 7 - I Don't Understand What Mya-nee Is Saying

Episode 8 - Sometimes Ignorance Is Bliss

Episode 9 - Please Stay Until I Fall Asleep

Episode 10 - I Said Too Much Again

Episode 11 - In Short, It's Your Fault, Onee-san

Episode 12 - Angel's Gaze

Doga Kobo

flying DOG

Kadokawa Shoten

Sony Music Communications

Kadokawa Media House

AT-X

Ichijinsha

WATATEN!: an Angel Flew Down to Me