Digimon Tamers
Released in 2001 alongside Motto! Ojamajo Doremi ~Secret of the Frog Stone~ and Digimon Tamers. The fans Shimada-san and Nakai-san are based on Kinnikuman creators Takashi Shimada and Yoshinori Nakai (Yudetamago). The ending theme, "Muscle Beat", was performed by famous martial artist Nobuaki Kakuda, who also provided the opening narration.