9-Nine is a Japanese adultvisual novel series developed and published by Palette. It was released for Windows in four episodes from April 2017 to April 2020. It was later ported to the PlayStation 4 and Nintendo Switch in June 2022.[1] An English version of the visual novels was released by Sekai Project from February 2019 to March 2021. An all-aged extra episode was released in April 2021. A manga adaptation with art by Izumi Kawachi has been serialized online via Futabasha's Gaugau Monster website since October 2021. A spin-off to the visual novels will be released in Q1 2025. An anime television series adaptation produced by PRA, titled 9-Nine: Ruler's Crown, is set to premiere in 2025.
An anime television series adaptation was announced on May 29, 2024.[3][4] The series, titled 9-Nine: Ruler's Crown, is produced by PRA and directed by Koichi Ohata, with characters designed by Saori Sakiguchi. The cast from previous games are set to reprise their roles. It is set to premiere in 2025.[2]