there isn't a country called Holland, right? http://www.mangago.me/read-manga/henshin_dek...

I think it's possible that the raw was in Spanish because it's a lot more common to refer in Spanish speaking countries (or at least in mine) to the Netherlands as Holanda or Holland as it was stated here more than "Países bajos" which would be the translation of Netherlands.
Actually it's really confusing to see under which circumstances Holland would be used, so yeah it is a country but it's complicated
so here https://en.wikipedia.org/wiki/Holland

netherlands is holland, in some countries we can use the two names to talk about netherlands

yes there is a country called Hollandand you can call it Netherlands too and i live there...

oh you mean Amsterdam

Netherlands = Holland