Summarize the plot of Deltarune Chapter 1.
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The first chapter of DELTARUNE begins with an ominous character creation screen, whose result is then discarded in favor of the protagonist, Kris. They head to school, where their teacher, Alphys, assigns them to work on a group project with Susie, the class bully. After Alphys finds that the blackboard chalk is missing, she sends Susie to get more from the school closet, with Kris watching over her. However, the inside of the closet turns out to have been replaced with an entrance to a mysterious dimension known as the Dark World.
The heroes arrive at a castle and are greeted by Ralsei, a shy wizard prince, who explains that they were prophesized to restore the balance between light and dark. Susie, however, rejects this quest, and Ralsei is bumped off the scene by a goofy motorcycle-riding kid named Lancer, the self-proclaimed "bad guy". After an introductory fight, Ralsei gives Kris a belated tutorial before proceeding to the adventure. Susie joins Lancer and attempts to stop Kris and Ralsei. Eventually, though, the four join forces and take on the tyrannical King, who happens to be Lancer's father. Finally, Kris uses their SOUL (a red heart) to close the Dark Fountain, which gives the world form; this causes them and Susie to end up in an unused classroom connected to the supply closet.
Kris gets a call from their mother, Toriel, who is worried by their not returning home; however, she's calmed by their explanation that they were spending time with a friend. After exploring the town, they return home and head to sleep. In a final cutscene, they're shown waking up in the middle of the night, ripping their SOUL out of their chest, violently throwing it in a bird cage, pulling out a knife, and looking at the camera with a glowing red eye and a menacing smile.
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Can you summarise it more briefly?
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