It is business as usual in the massive city of Orario, where legions of adventurers gather to explore the monster-infested "Dungeon." Among them is the easily flustered yet brave Bell Cranel, the sole member of the Hestia Familia. With the help of his demi-human supporter Liliruca Arde and competent blacksmith Welf Crozzo, Bell has earned the title of Little Rookie by becoming Orario's fastest-growing adventurer thanks to his endeavors within the deeper levels of the Dungeon. This season continues Bell's adventures as he tries to bring glory to his goddess and protect those he cares about. However, various familias and gods across the city begin to take notice of his achievements and attempt to add him to their ranks.

接下来的舞台是由“血之女王”、“妖狐”、“暴君”三势力统治的无法都市。 那里是无赖横行、弱肉强食的世界。为了讨伐吸血鬼们的支配者“血之女王”被姐姐克莱儿带走的希德，因为有机会做出“影之实力者”的行为而兴奋不已……。 围绕“血之女王”的阴谋开始展开，无法都市三股势力混杂一起。 此外，姐姐克莱儿也被卷入骚乱，暗影庭院也独自采取行动。 在极度混沌中，希德不为人知地开始扮演幕后暗影。 红月升起，觉醒的时刻到来了……