The anime adaptation of "Otonari no Tenshi-sama ni Itsu no Ma ni ka Dame Ningen ni Sareteita Ken" received a third image today, confirming its premiere next year.
Check out the image:

Synopsis
Amane lives alone in an apartment, and the prettiest girl in school, Mahiru, lives right next door. They've hardly ever spoken – until the day he sees her in trouble on a rainy day and lends her his umbrella. To return the favor, she offers him help around the house, and a relationship slowly begins to blossom as the distance between them diminishes…
Author Saekisan began serializing the light novel on the website “Shousetsuka ni Narou” in December 2018. GA Bunko 's SB Creative began publishing the story in print volumes with illustrations by Hanekoto in June 2019, and the series has over 500,000 copies in circulation. A manga of the work launched on the Manga Up! on January 6th.
Source: ANN

