So, I've been slowly watching the anime, and between episode 5 and 6 I became really confused. In 6 Nymph is there, while episode had no sign of her at all. So I had no idea on how Nymph got onto the story plot in the anime (and I have been faithfully reading the manga, so I know whats been going on still).

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guitarist for band "Bucket of Sushi" =D

as in this case, some animes does show content even after the ending, it shows when nymph locates tomokis* house and enters the house. tomoki thinks it's one of ikaros' friends when he wakes up so...

Yup, Nymph showed up in the stinger to episode 5.

I had the same question, and watched episode 5 again to make sure I didn't miss anything.

Of course, random crap happening out of nowhere is normal in this series Gets explained eventually, but still normal