According to Amazon Japan, an OVA of Namiuchigiwa no Muromi-san will be released on August 16th. It will be bundled with the ninth volume of the original manga.
Muromi-san anime official website
Trailer
The first episode of Muromi-san will be aired on April 6th.
Source: Amazon Japan
Namiuchigiwa no Muromi-san OVA on MAL
