Dive into the parallel story to UNDERTALE! Fight or spare your way through action-packed battles as you explore a mysterious world alongside an endearing cast of new and familiar characters.

Kris and their classmate Susie fall into an unknown place called the "Dark World" where they meet Ralsei, who informs them that they are prophesied, in the legend of Delta Rune, to be heroes that save the world.

Deltarune's full game will consist of seven chapters, each where Kris, Susie, and Ralsei either fight or act their way through Dark Worlds. Kris, being the only one who can seal the "Dark Fountain", is the party leader. They can command the other party members in battles, though some commands would seem forced to others. The SOUL, a heart-shaped object, is controlled by the player and is in Kris's body, leaving Kris's actions mostly up to the player.

A small child falls into the Underground, where monsters have long been banished by humans and are hunting every human that they find. The player controls the child as they try to make it back to the Surface through hostile environments, all the while engaging with a turn-based combat system with puzzle-solving and bullet hell elements, as well as other unconventional game mechanics.

"A long time ago, two races ruled peacefully over the Earth: HUMANS and MONSTERS. One day, a terrible war broke out between the two races. After a long battle, the humans were victorious. They sealed the monsters underground with a magical spell.

In the year 201X, a small child scales Mt. Ebott. It is said that those who climb the mountain never return.

Seeking refuge from the rainy weather, the child enters a cave and discovers an enormous hole.

Moving closer to get a better look... the child falls in.

Now, our story begins."

Anno: Mutationem set up a near future Metropolis after the catastrophy. Moreover, they’ve introduced the famous open-sourced work series “SCP Foundation” in to the world of Anno: Mutationem, to mix the creative ideas of authors from all over the world.

Welcome to the neon-covered, 2D-meets-3D Cyberpunk world of ANNO: Mutationem. In this Action-Adventure game with RPG elements, you become Ann: a highly-skilled combat-trained lone wolf on a personal mission in a giant Metropolis, full of sinister mega-corporations, mysterious fringe groups and creatures more bizarre than words can express. Featuring a grand story befitting a rich and dark cyberpunk décor, featuring our main hero Ann and her trusty hacker side-kick Ayane.