The first three seasons of the TV series were originally animated by MAPPA until studio Millepensee took over in 2015, animating the succeeding five seasons.
The 13th compiled volume of comedy manga Teekyuu has announced that the TV anime series will receive a ninth season to premiere this Summer.
The manga began its serialization in Comic Earth☆Star in February 2012 by Tsugeo Terada and Piyo.
The volume will officially be released on April 12.