Kumo desu ga, Nani ka?

Synopsis

Fortunately for Nameless, Araba does not consider her worth its attention and leaves. Finding herself stuck in the lower stratum, she begins exploring whilst constantly having to hide as every creature down here is much stronger than her. She eventually finds herself starving and resorts to eating the only species weaker than her: grubs so poisonous eating them almost kills her. Eventually, she starts to level up again and manages to defeat several weak monsters. However, she makes a huge mistake when she kills a monkey monster, which prompts its entire family to attack her in retribution. Finding herself trapped, she is forced to fight the horde. Following a prolonged battle, which she only survived thanks to the skill that heals her upon leveling up, Nameless stands victorious. Having defeated the monkeys, Nameless finds what seems to be the path back to the upper stratum, but instead finds herself in the middle stratum; a lava level.

(Source: Wikipedia)