When does SSSS.Gridman return?

SSSS.Gridman is a Japanese anime television series jointly produced by Tsuburaya Productions and Trigger. It is the first installment in the shared Gridman Universe media and an adaptation of the 1993–1994 tokusatsu series Denkou Choujin Gridman. The story focuses on Y?ta Hibiki, an amnesiac first-year high school student living in the fictional Japanese city of Tsutsujidai.