Hmm, art stlye doesn't seem like it's from an hentai...b-but NIPPLES!

Oh mighty Danbooru community, y'all shall help me by naming the series this pic comes from!

Doesn't have to be hentai. Onegai Twins had nipples and it wasn't hentai.

It's Diebuster

@localperv

I was just saying that we can exclude the Hentai genre from the list of possible series.

@gozaking

Thanks. I must have completely forgot about that scene in Diebuster. *facepalms in shame*

I approve the nice nipples.