I still remember the exact moment the Annoying Dog shuffled across the couch. It was September 15, 2021, and I was watching Undertale's sixth anniversary livestream with a mix of nostalgia and ridiculous hope. Toby Fox and the team at Fangamer had spent the evening replaying Deltarune Chapter 1, cracking jokes, and showing off merch. But I kept asking myself: was this just a birthday party, or was something bigger hiding behind the cake? 🎂

For years, Deltarune Chapter 2 had been a rumor with a pulse. Fans had whispered about a possible late 2020 release, but that window closed. After that, information was sparse — a few screenshots, a lot of theories, and an ocean of silence. Then Fox announced the anniversary stream. Leading up to it, we got new Undertale stickers and Good Smile Company Papyrus and Sans figurines. Cute, yes. But not the main course. 🎮

The stream itself was a Deltarune Chapter 1 playthrough, and it felt like a warm reunion. The hosts from Fangamer kept the energy light. Then, after the three hosts left the set, the mood shifted. The Annoying Dog plush — Fox's avatar, basically — slowly crept toward the controller on the couch. On screen, two options appeared: 'Keep Playing Chapter 1' or 'Continue to Chapter 2.' My heart did a somersault. Which one would they pick? The second, obviously. And with that, all-new footage of Kris, Toriel, and Susie rolled into an official teaser. ✨

According to the video and Toby Fox on Twitter, Deltarune Chapter 2 would arrive on Friday, September 17 at 8 PM EDT for PC, Nintendo Switch, and PS4. I remember staring at that date like it was a secret code. A two-day wait felt both cruel and thrilling.

Detail	Info
Release date	Friday, September 17, 2021
Time	8 PM EDT
Platforms	PC, Nintendo Switch, PS4
Announced during	Undertale's sixth anniversary livestream

Even now, in 2026, I think about how much that night mattered. Since then, Deltarune has grown beyond Chapter 2: Chapters 3 and 4 arrived in 2025, and the fandom is already looking ahead to Chapter 5. But in 2021, Chapter 2 was the impossible sequel we had been begging for. It was the chapter that proved the story of Kris, Susie, and Ralsei was not a one-off experiment.

During the broadcast, Fox talked about a variety of inspirations. He said he purposefully framed the world of Deltarune to 'make it seem like Undertale.' That line stuck with me. Was it a troll? A promise? A confession? Maybe all three. The Chapter 1 build played on stream also contained several unique Easter eggs not present in the consumer release. NPCs like Birdly made fourth-wall-breaking references to the real-world event. A birthday cake with the number six at its center could be spotted sitting on a shelf in the background of Seam's shop. Those tiny touches made the stream feel like a private party for the determined. 🐶

Fangamer also revealed several new pieces of series-branded merchandise, including new mugs, a blue Sans hoodie, and small figurines of Undertale characters like Sans, Papyrus, Frisk, and Toriel. I may or may not have opened a new tab immediately. (I did.) 💙

What makes a reveal like that stick? Is it the game, or the community around it? For me, it was both. Deltarune Chapter 1 had already rekindled fans with determination years earlier. The impending launch of the second chapter of Kris, Susie, and Ralsei's story seemed poised to do the same. The stream was good-spirited and full of humor, but it also carried weight. It said: this story is still going.

Now, in 2026, we know more. Deltarune's later chapters have expanded the dark worlds, the music, the jokes, and the heartbreak. Yet I still measure time by that September 17 release. The night the Annoying Dog touched a controller. The night 'Continue to Chapter 2' stopped being a joke and became a date. The night a sixth anniversary stream quietly turned into one of the most memorable moments in indie gaming. 🧡