Okay but like... What if Yandere!Ralsei and AfterTale had a weird fusion? DR:TPP follows the story of Deltarune's first chapter as normal, until Ralsei falls to the Chaos King, swooned and unrevivable. Kris and Susie, unattached to the Darkner, walk onward, sealing the Dark Fountain. They return to the Light World as normal, ending the chapter with minimal differences, but... When Susie and Kris return to the closet Dark World the following day, they are met with a Castle Town fallen into even further disrepair. They inspect the environment for a time before leaving to work on their school assignment at the library with Noelle and Berdly, but the computer lab has become a Dark World. Noelle is captured, but suddenly Queen is struck down by an ominous figure. Ralsei, betrayed, seeks revenge on the Lightners that left him to die. This story really kicks off in Chapter 2, as Ralsei's vengeful spirit, imbued with a certain power, follows Kris, Susie and Noelle through the Cyber World, chasing them down like a rabid animal. It isn't really a happy story, but a moderately okay one regardless. Feel free to ask further questions, I might expand on it later.