Collecting data on Earth Cultures

Well Eris is a scout of the Katians, and first arrived on Earth, then assigned to gather information and data on the Cultures of Earth. But I'm not sure if the Mangas and adult Doujins of one Otaku Boy's collection can give you accurate information on the entire planet's culture :XD:

Original Artwork by Houden Eizou:
http://img824.imageshack.us/img824/903/ka03080491.jpg

Coloured by the Software: Recolored
https://recolored.en.softonic.com/?ex=CORE-117.5