This is a unofficial sequel of Undertale, in the style of a dating sim.

Long ago, two races ruled Earth… but you already knew that. This is not the story of how monsters where trapped underground, this is the story of how they tried to return to the surface.
After they were freed, monsters tried to live along side humans. But as expected, humans didn’t exactly welcome them with warm arms.

With humans being attacked and monsters disappearing, the only chance for peace seems to be convincing the daughter of the mayor, the manager of the orphanage Frisk grew up in, that monsters are not as bad as they may seem. But strange nightmares seem to haunt you at night, and you are losing your determination.

Can you make peace between humans and monsters? What are these memories that haunt you? Can you free everyone this time?

[From Itch.io]