That's Yoka Choc. They've been around in Tokyo since 1986 (big year for Congolese music there) and have been "confirmé" by Zaiko, Wemba, and Kester. They have very genuine passion for the genre and have contributed greatly to the artists that have been to Japan - venue planning, lodging, paying for equipment, etc.
I have two of their albums and they're pretty good - mostly original compositions. I think we shouldn't always get mad when people of different skin/ethnicity to on our genre. The Jamaicans don't seem to mind all that much with Reggae