Is there any serious romance in No Game No Life? I know the genre of this anime, however after watching "Your lie in April" and "Plastic Memories" in a row, I feel I need to tread very very lightly before watching a new anime, as they had a significant emotional impact on me.

So, is it romantic is there a serious romantic theme. Or is it more aimed at funny and/or sarcastic relations (lighthearted romance), such as in D-frag or Prison-school?

If possible I would like to avoid the more serious romantic/drama series for now.
No, No game no life is not 'romantic' in the way plastic memories and your lie in April where, the emotional touching way.

No game no life focuses a lot more on a 'comedic aspect' of romanticism, and over the top brother sister love. And all though this is a red line throughout the series, the games they play have the bigger focus in the 'serious' parts of the series.