It will premiere in 2019
In the eight tome of the manga of Joshi Kausei it has been revealed that an anime adaptation is in the works and will be coming in 2019. No more details were revelaed.
My anime list describes the story as follows:
“Who needs dialog when you’re this cute? The beautiful (but unlucky) Momoko, the cool, collected Shibumi, and the refreshingly innocent Mayumi star in a “silent manga.” No speeches, no dialog! Just pictures, sound effects, and three high school girls living their daily lives.”
Via: Crunchyroll Latín América (Spanish)