Undertale is an indie video game developed by Toby Fox, initially released in 2015. It features a unique combat system where players can choose to spare or fight monsters, impacting the storyline and outcomes. The game is renowned for its humor, engaging narrative, and memorable characters. While not an anime, its distinctive art style and storytelling have inspired various fan-made animations and comics. Undertale has gained a dedicated fanbase and has been praised for its innovative approach to gameplay and storytelling.