Arifureta Shokugyou De Sekai Saikyou Episode 1 Here

The class enters the Great Orcus Labyrinth for training. When a powerful Behemoth is accidentally summoned, the students panic. Hajime uses his transmutation skills to hold the bridge, allowing his classmates to escape. As he prepares to retreat, a malicious "friendly fire" fireball from one of his own classmates sends him plummeting into the lightless abyss of the dungeon’s lower floors. The Bottom of the Abyss

Hajime Nagumo is a mundane high schooler living a nightmare: his entire class has been summoned to the fantasy world of Tortus as heroes, while he is gifted with the useless "Synergist" class. While his peers gain flashy combat skills, he can only transmute materials like a glorified blacksmith. The Betrayal Arifureta Shokugyou de Sekai Saikyou Episode 1

He absorbs the monster’s magic and skills, skyrocketing his power levels. The class enters the Great Orcus Labyrinth for training