YES!! It's for real!!! I did a lot of digging and I found out through this website:
But I'm planning on waiting for Arina to release more teasers of this manga before going right on ahead and pre-ordering it through Amazon. LOL
Here I would like to start this topic where we keep on adding new updates about Arina-Sensei! I know many of us don't have all the time in the world to go upon 20 tabs of google search then google searching in broken Japanese to eventually find new fresh work that she might be working on. So it'll be nice if we can keep updating this page.
LATEST UPDATE (as far as I know)
Frozen two manga adaptation is coming out.
She worked on a new ad campaign for beauty brand Shiseido's Tsubaki hair care brand.
To see the work she did for the ad: https://www.animenewsnetwork.com/interest/2019-09-03/manga-legends-moto-hagio-arina-tanemura-collaborate-on-shiseido-hair-care-campaign/.150702
It took me 8 times to finally login... I was so confused because I forgot how my display name looked like and whether I had used CAPS. BUT man a I glad to be here!!! Great NEW LOOK!! I like how this forum looks so nice a modern.