User blog comment:RumbleXRumble/Neon Nostrade Theory/@comment-14902757-20130910024926/@comment-11310718-20130910034218

I agree, there is an article here that mentioned Genius in Nen.

NOTE: DO NOT READ THIS COMMENT IF YOU DON'T WANT TO GET SPOILERS

THe gungi girl komugi learned nen while playing gungi(somewhat like chess) against the king withouth her noticing it or doing it on purpose, it just happened.