Porn Game: Onmyoji in the Otherworld: Sayaka's Story - Final by Debonosu Works

Overview:
In a regional city in the present day, Sayaka Mimuro manages her family's Shinto shrine on behalf of her absent parents.
Along with her ch*ldhood friend Haru and a talking furball (rabbit?) god, she lives a peaceful life, but when an earthquake strikes, aggressive spirits suddenly appear and her world is torn apart.

Sayaka receives divine tidings that the only one who can save the city is herself—she's actually an Onmyoji with the power to vanquish spirits! However, in order to unlock her powers, she must first perform certain rituals with a man...
"...If I'm the only one who can do it, then I guess I have no choice!"

Sayaka is bewildered to say the least, but her natural sense of justice gives her the resolve to fight...
"There is only one person I can ask to do this and that's you, Haru... Please?"

With no one else to turn to, Sayaka asks a confused Haru to be the male partner she needs for her rituals. With his help, Sayaka finally unlocks her battle-princess powers to wage war on the spirits that ravage her city...​

Onmyoji in the Otherworld: Sayaka's Story - Final by Debonosu Works game preview

online.