Oni-slaying Miko tries to hunt down an Oni that keeps killing civilians. She finally manages to defeat him before losing consciousness but not before he overwhelms and rapes her. She wakes up in hospital with friends who are worried for her. She realizes that she was poisoned with Oni curse and is becoming an Oni herself, then attacks her friends, kills the man, turns the woman into Oni and takes over a shrine. Later Oni-slayer comes to hunt her down but is easily beaten and then also corrupted into another Oni.

This is Japanese version created by author.
Link to English version is here:
https://e-hentai.org/g/2223641/dc7b847e77/

Author creates classic corruption stories and posts them on pixiv and fanbox. Office ladies, students, teachers and exorcists become evil and sexy monsters like Vampires, Succubi or Oni. They are pretty good though a bit short when it comes to text.
Some of his works are already posted here so I thought I will add some more. Author recently started adding english translations of his work. Translations are mostly through machine but they are not that bad and it's better than nothing. Below are some links:

Links:
Pixiv: https://www.pixiv.net/users/375450
Fanbox: https://www.fanbox.cc/@marsa
Twitter: https://twitter.com/marsax_