iOS released in 2011, which was developed by the five-person "miHoYo studio" startup team. The first installment of the Honkai series was Zombiegal Kawaii released in 2012. The series has seen several more games since, with the most recent main entry being 2023's Honkai: Star Rail.

The Honkai series is set in a universe called the "Imaginary Tree" and follows the adventures of characters such as Kiana, Mei, and Bronya. While the series features recurring characters