Following Keima's victory against the Flame Cave, he gains access to a useful new tunnel and his dungeon becomes more popular than ever. Unfortunately, more guests mean more work, and when Meat collapses while serving customers, Keima is forced to face a long-ignored problem -- he needs more staff! But with his and Rokuko's identities a secret, Keima's best option is using his precious DP to summon a humanoid monster! Has he solved his dilemma or just made things worse?!