It will premier in 2018.
The Official twitter account for the One Room Anime has announced that a second season has been green-lit.
The anime will premier in 2018, although more details are still unknown.
Crunchyroll describes the story as follows:
“You are the protagonist. A new project in virtual anime from SMIRAL Animation that also brought you the “Anitore” series and “Makuranodanshi.” This time, the project is about 3 stories that develop in your (one) room.”
Via: Anime News Network