That Time My Significant Other Was "Spider-chan"

Reincarnated in another world? Tsundere loli? Elf big sister? Cute dragon maid? No! No! No! It’s a "Super Hell Mode" start: reincarnated as the weakest monster–a Lesser Taratect. Born into the world's most terrifying "Elroe Labyrinth," a place teeming with vicious monsters. Every day is a heart-pounding struggle; to survive, you must use every dirty trick in the book. Tragedy is a daily occurrence, and losing limbs is just a typical Tuesday. You ask how the protagonist pulled through? Well, that’s because we have our "waifu," Spider-chan (Kumoko). The official translator for our socially anxious spider-girl has arrived! An epic journey toward godhood begins right now... — Description from novelcodex.org