Based on a Japanese manga series written and illustrated by Akihito Tsukushi. It has been serialized online in Takeshobo's digital publication Web Comic Gamma since October 2012.
The first season adapts the first three manga volumes in their entirety, and it concludes with the first chapter of the manga's fourth volume.
First episode received a special pre-air on June 18, 2017. Regular TV airing started in July 2017.