Murata’s manga series adapts ONE’s original web manga of the same name.
Viz Media is publishing the original manga series digitally on its Weekly Shonen Jump anthology, and it is also releasing the series in print.
The anime’s Japanese Blu-ray Disc and DVD volumes include six original video anime episodes, and the manga’s 10th volume in Japan shipped with an OVA in December.
The staff also announced that the series is getting a smartphone game app next year.