Hekaton

Part of Robotic;Notes series.

In a world where the telephone was never invented and a tool called "densho" (radio) was developed, and where pigeons fly everywhere, there is a "Bird God" who oversees all pigeons, and Mihata, an ordinary high school girl who loves cats, the pigeons' natural enemy. They are both girls, but...

Adell is the lone human being in a world of humans-turned-demons, made by Overlord Zenon. It's Adell's task - and burden - to defeat Zenon and restore his friends and family to their normal selves. But summoning an Overlord is not easy. When Adell tries to call Zenon, he ends up with his daughter, Rozalin. Now, bound by contract, Adell promises to take Rozalin back to her father. However, it will take much more than blind courage to defeat her all-powerful father and save the world. NOTE: Only volumes 1 and 2 got an official english release by the now defunct Broccoli Books.

Etranger, a villainous noblewoman executed for her unparalleled wickedness, finds herself in hell, a realm inhabited by demons, after her execution, unable to resist. Surrounded by terrifying (?) demons, she vows not to regret her past life, but to stay true to herself and survive in hell!