Talk:Extra: Black and a Mask/@comment-36209226-20190318174507/@comment-26086835-20190319130316

actually at Volume12 of Light Novel already mention about How Diablo find out about Rimuru and his Connection with Shizue which were released at Japan almost a year ago.

luckily the Anime expand about this since this serve as additionaly character Development and additional Background for Diablo and his Connection with Shizue and Rimuru so nope this isn't a cheap intro, its only seems cheap because the fight against the Arch Demon Orthos were lack of Suspence and anticlimatic.