He wakes up as Tanya in a , where Being X -- basically god -- reveals that she'll go to hell if she does not die a natural death or express faith in him.
Every once in a while I check older manga to take a look at their update frequency to know if I need to migrate that one or not.
A Veterinarian in Another World is an Isekai, but with a superpowered version of a normal profession rather than some mighty hero.
Her sister was the main character of this reverse-harem romance while she was one of the villains causing Aria to suffer hardships.
If so, we have the solution for you.
Defeating the Obelisk Tower and get revenge for his brother.