Lead vocalist will also perform Ultraman R/B opening.
Masayoshi Oishi as part of the duo OxT will perform the theme song “UNION” for the upcoming SSSS.Gridman anime series. The series is an adaptation of the 1994 Tsuburaya tokusatsu TV series, Denko Chojin Gridman (Lightning Superhuman Gridman)
Oishi is also performing the opening theme for the upcoming Ultraman R/B TV series.
Source: Official website