Board Thread:Questions and Answers/@comment-185.28.248.2-20150102223241/@comment-25188867-20150104181115

It depends.

tl;dr: If this game is a small time thing, the unofficial answer is "Sure, why not."

Technically, the MGE images are not copyrighted in most western countries, as I'm confident KC has not registed with the WIPO (World Intellectual Property Organization). I don't even know if he copyrighted them in Japan. A general good rule of thumb is: "If your prduct will be seen or used by less than 100 people, you are probably okay."

Be sure to credit KC for the pictures though.

If you really wanted to be sure, you could try and contact him. You may want to try the more popular forums on how to go about that, like Monster Girl Redux, or The Monster Multiverse. Or if you know japanese, you could try contacting him directly.

Or you could not read this huge wall of text and just read the tl;dr.