覇界王〜ガオガイガー対ベターマン〜 覇界王
Light novel sequel to both [[Yuusha Ou GaoGaiGar FINAL]] and [[Betterman]], set 10 years after the end of GGG FINAL. Began publication in 2016, and a manga adaptation began publication in 2018.

Despite not having an anime adaptation, the series made a surprise SRW debut in [[Super Robot Wars 30]].
hakaiou: gaogaigar vs. betterman