Yikes! What is this from?

Also, why is the name "Jacobus Racan" being used? For starters, the OFFICIAL last name is "Rakan" (which is how Akamatsu spelled the name in English) and his first name is "Jack" though "Jacob" could be correct to. The "Jacobus Racan" comes from his pactio card, which does not spell any name in proper English (but in Latin form).

OMG ! It's just a picture ,not a Japanese to English lit class ! get over it..

He wasn't talking about the picture, but the way it's been tagged.

Danbooru tags are serious business. *nods sagely*