This has to do with lorekeep. He apparently found a werewoman manga. It apparently involved a cute idol girl, and using 'large lights' as fake full moons.
Also can anybody find this different manga called Totsugeki! Moon Musume (突撃!ムーン娘)
Its apparently about a family of werewoman.
https://tgmangas.xeraweb.com/ml/books/totumoon_c.jpg
This page has more info on it:
http://em003.cside.jp/~s03219-1/bbs/past.cgi?area=25