Greatly influenced by lucha libre, Masamune has followed Mexican tradition for masked wrestlers, so his real name is not a matter of public record.

[4] At some point in 2007, Masamune and Hideyoshi joined up with Atsushi Kotoge, Black Buffalo, Condor, Gaina, Kazushi, Zero and Zeus to form a group known as "Bad Force".

By the time Osaka Pro Wrestling revealed that they had secured financial backing and was not closing, a number of wrestlers, including Masamune, had already committed to DPW.

The Joker group reformed in DPW, consisting of Kuuga, Gamelas, Kazuaki Mihara and Masamune, effectively ending Sengoku after being a regular team for seven years.

[2] Masamune and his partners Kenzo Suzuki and Tiger Mask III were eliminated from the tournament in the first round by Team MexLeyendas (Blue Demon Jr., Dr. Wagner Jr. and El Solar).