A teaser. Press z to continue the dialogue (if you press before finished the dialogue will disappear) and if wou want to skip it, press s.
Undertale and Sans sprites by Toby Fox, Underswap by P0pcornPr1nce, Papyrus sprites by addicted2electronics, Storyshift by voltrathelively, Triple the Threat by Ace. Chara sprites by ??? (unknown origin).
