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)

In Orario, fearless adventurers band together in search of fame and fortune within the monstrous underground labyrinth known as Dungeon.
 
But while riches and renown are incentive enough for most, Bell Cranel, would-be hero extraordinaire, has bigger plans.
 
He wants to pick up girls.
 
Is it wrong to face the perils of Dungeon alone, in a single-member guild blessed by a failed goddess? Maybe. Is it wrong to dream of playing hero to hapless maidens in Dungeon? Maybe not. After one misguided adventure, Bell quickly discovers that anything can happen in the labyrinth--even chance encounters with beautiful women. The only problem? He's the one who winds up the damsel in distress!
 
(Source: Yen Press)

The third season of Dungeon ni Deai wo Motomeru no wa Machigatteiru Darou ka. 
 
When Bell encounters a frightened little girl in the dungeon, he doesn’t think twice to help. But this simple act of kindness has consequences. The girl is a monster and proof that monsters can be eerily human. And not everyone can accept this... 
 
(Source: HIDIVE)

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)

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