Honkai: Star Rail is a new HoYoverse space fantasy RPG. Hop aboard the Astral Express and experience the galaxy's infinite wonders on this journey filled with adventure and thrills.

Honkai follows the gameplay conventions of classic Japanese role-playing games: players build up a roster of characters, and control a team of four of them in turn-based combat. Elements of open-world and dungeon exploration are present, with many mechanics and the gacha system carried over from HoYoverse's action RPG Genshin Impact.

The game is set in a science fantasy fictional universe in which humanity follows godlike beings, the "Aeons," and struggles to stave off a pervasive corrupting force, the "Fragmentum." The player character, the "Trailblazer," whose name and gender is chosen by the player, awakens without their memory aboard a space station, discovering that they are imbued with a disruptive cosmic entity, the "Stellaron." They join a band of adventurers, the "Trailblazers," traveling from world to world aboard the "Astral Express", their space train.