Kumo desu ga, Nani ka?

Synopsis

After evolving, Nameless is suddenly attacked by a group of humans and while fleeing from them accidentally falls down a hole. At the Academy, Shun's class is having magic practice. However, Hugo causes a scene in an attempt to stand out. The class is then suddenly attacked by an earth dragon, which kills the teacher. Hugo arrogantly tries to defeat it alone, only to get instantly knocked out. Emulating his older brother, the <Hero> Julius, Shun attacks it with the other reincarnates and manages to kill it. However, afterward, Shun is horrified to learn Fei gained the title <Kin Eater>, meaning the dragon was probably her parent, while Hugo is infuriated as Shun is celebrated as a hero. Back with Nameless, she now finds herself in the dungeon's lower stratum, filled with monsters that utterly outmatch her. However, she then crosses paths with a high-level earth dragon named Araba, who easily kills them. Nameless tries to hide, but Araba notices her, leaving her at the dragon's mercy.

(Source: Wikipedia)