there is an anime television series based on this light novel by madhouse. it has 3 seasons with 13 episodes each. the first season aired from july 7 to september 29, 2015. the second season ran from january 9 to april 3, 2018 and the third season from july 10, 2018 to october 2, 2018. the scriptwriter for the anime series said that the fourth season of the series was "extremely likely" to be produced.