Please disregard the cover image, I couldn’t help myself.
I don’t think anyone was expecting this, especially when considering how extremely rare nudity is from animation studio Doga Kobo. If you look closely you can see nipples appear several times (very briefly) for the megane character (Tamaki Yurine). The blonde girl (and main character) Atena manages to stay covered up.
According the comments yesterday, it seems that previous volumes may have had sneaky nudity as well.
So much for the Winter 2016 season snapping a decade long streak of having at least 1 nipple sighting per season. The streak stays alive, and in perhaps the most unlikely way imaginable.