As it just so turns out, the former prime minister Noah Gibun is an outsider--a Cross Reverie player who was pulled into this world--just like Diablo! She desperately wants to defeat the Gelmed Empire, but due to their overwhelming power, she has to recruit Diablo and the young Demon Lord Klem. The antisocial Diablo wants no part of this! Will he be able to deal with fighting alongside a party for the first time ever? Will he finally overcome his social anxiety?