The series follows high school student and light novel author, Masamune Izumi, who found out that his novels’ illustrator, Eromanga Sensei, is his little sister, Sagiri, who never comes outside her room.
The author behind the OreImo light novels, Tsukasa Fushimi, is also responsible for Eromanga Sensei.
The new video doesn’t just announce the new OVA, but also reveals that it will be released in 2018.
And as revealed in the TV anime adaptation, the two series seem to share the same universe.