Aracnomania

Arachnids are spiders that mimic humans and eat them. Their appearance has threatened the survival of mankind. One day, Tsumugi, a lonely boy who loves spiders, meets an Arachnid named Senshou who is interested in him. When the incompatible threads of destiny of the eater and the eaten intertwine, what will be woven together? A dystopian bromance depicting the symbiotic relationship between a heretical predator who doesn't eat humans and a boy who loves spiders. (Source: Kadokawa, translated)