WATATEN!: an Angel Flew Down to Me: You Never Let Us Down / Always Growing Closer / Let's Change You Into This! / I'm Your Big Sister is a oVA anime that premiered in spring 2019, produced by Doga Kobo.

About the production: the story comes from a manga, there is 1 episode of about 24 minutes and its current status is "finished".

Its main genres are comedy and slice of life, with themes such as Primarily Female Cast, Female Protagonist, Cute Girls Doing Cute Things and Primarily Child Cast.

On AniList, WATATEN!: an Angel Flew Down to Me: You Never Let Us Down / Always Growing Closer / Let's Change You Into This! / I'm Your Big Sister has an average score of 71%, a good score, and appears on 13,429 users' lists.

OVA bundled with the third BD/DVD release. Hinata Hoshino, Hana Shirosaki, and Noa Himesaka are off to the countryside for a camping trip. At Hinata's behest, her elder sister, Miyako, reluctantly tags along. Seeing how gloomy Miyako is, the trio do their best to get her to enjoy herself too. Besides the camping trip, Watashi ni Tenshi ga Maiorita! Special contains three more short stories of the girls. Although their lives seem normal, one thing is certain: there is definitely no shortage of cuteness here!

Official synopsis from AniList.