Shouldn't it be on this list?

I think that would belong in the "NieR" series, and games probably can't be a part of two groups at once.

(Yeah, I know I'm replying 4 years too late haha)

I know I'm replying to this 9 months late but a game on src can be in 2 series at once

Yeah games can be in multiple series on sr.c "The Legend of Korra" should be in Avatar series as well.