Limbo is a shut-in girl who doesn't care for anything except her tentacle comics. Aside from that, everything else is meaningless. On her birthday she wished for the "destruction of the world" and was instead met with a demonic female programmer!

The two instantly hit it off, bonding over their common goal of world destruction, the two "project partners" hustle hard everyday to bring the world to an end with hilarious effect.

(Source: Bilibili Comics)