Actually it was Banri that fainted not 2D-kun. As you can see, he's still standing on the top of the staircase. This happens in episode 7 at ~7:30-7:40


Koko said she loved Banri in episode seven at about 7:25


I would imagine it's a parody of the character, they look very similar (ignoring style differences) and share the same names (also in capitals like the manga/anime's title as mentioned in another answer) and are both punk/rock musicians. Otherwise it's a large coincidence, but I would imagine it was intentional, as Nana is a very well known series.


it seems like the character from Golden Time is copying NANA, because on wiki (Russian) it is said that Tada Banri read the NANA manga while hospitalized.

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