Initially an amateur company team, they competed in the Kantō Leagues during the 1960s, rising gradually through the ranks of the prefecture's rugby pyramid.

In 1968 they undertook the first tour in their history when they travelled to South Korea to face a number of university and company teams there.

Further titles were added in 1986 and 1987, before the Wild Knights were entered into the new East Japan Rugby Championship against other top clubs from Kantō and Tōhoku.

Rugby in Japan was a growing sport, gradually gaining popularity and competitiveness outside of its normal strongholds in company break-rooms and college campuses.

Although still nominally amateur, the Wild Knights nonetheless used their position in the Tokyo Sanyo corporation to hire talented foreigners to 'work' for the company with the real intention of playing for the rugby team.

Held annually between September and February, the Top League would mark a new future for the sport in Japan and a fully professional structure would help clubs like the Wild Knights to attract better players.

However, the club's success was mirrored in the fact that Naoki Kawamata, Shota Horie, Seiichi Shimomura, Tomoki Kitagawa and Atsushi Tatanabe selected in the league's Best XV.

In 2011, despite finishing in 3rd during the regular league season, the club won the Championship play-offs by beating Suntory Sungoliath 28–23 in the final.