Porn Game: Tentacle Chastisement Room - Hybrislave Final

Overview:
Once upon a time, the sudden appearance of monsters called "Burana" invaded human territory,
and a war between humans and Burana broke out.
Many men were killed and women were raped, but after a long battle, humans finally sealed the gate to the Makai.
However, the losses suffered by various countries were enormous, and they are still struggling to rebuild their countries.
Many areas still lack basic infrastructure, and the Burana that have survived in various places are breeding and continuing to survive...
　――This is the story of a girl living in such a world.​

Tentacle Chastisement Room - Hybrislave Final game preview

online.