Lantis has posted a short promotional video for "Kenzen Robo Daimidaler" by Endoh-kai, the OP song for the new robot TV anime of the same name. Endoh-kai is a male-only singer group headed by Masaaki Endoh, who is known as a member of JAM Project and for his solo hit anime/tokusatsu theme songs such as "Yuusha Ou Tanjou!" (The King of Braves GaoGaiGar OP) and "Bakuryuu Sentai Abaranger" (the OP song for the 2003-2004 Super Sentai series).
Probably regardless of the story of the anime, the four members of the group (Masaaki Endoh, bamboo, Takeshi Washizaki, Yamaken) are performing a typical Yakuza story in the video. Since the word "kai" means association or club in Japanese and often used for the names of Boryokudan (Japanese criminal gang group/Yakuza clan). The song "Kenzen Robo Daimidaler" will be their debut single.
The full members of Endoh-kai