Kumo desu ga, Nani ka?

An unexplained catastrophe kills an entire classroom, and the students are reborn in another world filled with magic and monsters. Many receive human bodies and comfortable positions, but one girl wakes deep inside the world's most dangerous labyrinth as a tiny spider from one of its weakest species. With no allies and almost everything around her capable of killing her, she treats her new existence like a survival game: observe, improvise, fight, and build every skill she can. Her stubborn climb from the bottom of the food chain becomes far more than a struggle for the next meal, as the truth behind the class's deaths and this new world begins to reveal itself.