"root letter" was released for the playstation 4 and the playstation vita by kadokawa games on 16 june 2016 in japan, and by pqube on 28 october 2016 in europe and 1 november 2016 in north america. it was also released for microsoft windows in japan on 31 march 2017 and internationally on 7 july 2017, and for android and ios in japan on 25 august 2017.