Apparently they play with a few different instrumental lineups, here's one with a guitar and a piano
Very nice, extremely listenable, well done.
Here is a short set video, starts with 'What is Hip?' and goes into some other stuff, including some songs with vocals
https://www.basitours.com/artist-roster/tokyo-groove-jyoshi#:~:text=TOKYO GROOVE JYOSHI - a female,around 500 music live concerts.
At 10:05 there seems to be a guitar part. I guess it could be played on keyboard...?
Gotta say they rock pretty hard.