The light novels from Kumo Kagyu began in 2016 with seven volumes out as of March 2018.
A manga adaptation by Kosuke Kurose began in 2016 as well with Yen Press releasing both of them in North America.
With Funimation producing a dub and Yen Press bringing out the manga and light novels, the property is getting a solid round of promotion in general and another season of anime is pretty much expected.