The fourth season of Dungeon ni Deai wo Motomeru no wa Machigatteiru Darou ka. 
 
Intrepid adventurer Bell Cranel has leveled up, but he can’t rest on his dungeoneering laurels just yet. The Hestia Familia still has a long way to go before it can stand toe-to-toe with the other Familias of Orario — but before Bell can set out on his next mission, reports of a brutal murder rock the adventuring community! One of Bell’s trusted allies stands accused of the horrible crime, and it’s up to Bell and his friends to clear their name and uncover a nefarious plot brewing in the dungeon’s dark depths. 
 
(Source: Sentai Filmworks)

The second cour of the fourth season of Dungeon ni Deai wo Motomeru no wa Machigatteiru Darou ka.
 
Bell and Ryu end up in the 37th floor, which is a Deep Floor. The rest of the party are at level 27, facing the level boss Amphisbaena. They have to defeat the level boss, in order to save Bell. At the same time, Bell and Ryu have to find a way to stay alive on a floor with strong monsters while having to avoid the Juggernaut.
 
(Source: Anime News Network)

Marie