
At the 2015 edition of the Goddesses of Stardom Tag League, Kris Wolf and Kyoko Kimura teamed up to represent the stable in a first-round match where they fell short to Hiroyo Matsumoto and Santana Garrett on November 11.

At Stardom Mask Fiesta 2015 ~ Halloween Party on October 25, La Rosa Negra represented the stable in a six-persom masked tag team match where she teamed up with Black Dragon and Kaoru Maeda in a losing effort to Io Shirai, Mayu Iwatani and Último Dragón. This was the latter's last match in Stardom and as part of Oedo Tai. On September 23, on the eight night of the tournament, La Rosa Negra successfully captured the High Speed Championship from stablemate Star Fire, with no major occurrences after the match. During the 5★Star Grand Prix 2015 tournament which took place beginning on August 23, La Rosa Negra joined the group, while competing in the B block of the tournament against stablemates Kris Wolf and Hudson Envy, Mayu Iwatani, Kaori Yoneyama and Io Shirai.

Nikki Storm also made her first appearance in Stardom as part of the unit on June 14, at Stardom Galaxy Stars 2015, where she teamed up with Star Fire and unsuccessfully challenged Io Shirai and Mayu Iwatani for the Goddess of Stardom Championship. On the second night of the Stardom Golden Week Stars 2015 which took place on May 6, Star Fire marked her debut in the unit by teaming up with Kris Wolf in a losing effort to Io Shirai and Mayu Iwatani in the semi-finals of a tournament to crown new Goddess of Stardom Champions. On the fifth night of the Stardom Grows Up Star 2015 on April 12, Thunder Rosa teamed up with Kris Wolf to defeat Mayu Iwatani and Momo Watanabe, match which would mark her debut in the promotion as part of the stable.

Three days later from the occurrence, Stardom held a press conference where Yoshiko apologised for her actions, but subsequently remained suspended. Yasukawa, who was the Wonder of Stardom Champion at the time had to furtherly relinquish the title on May 1, due to complications from her multiple injuries caused by the incident. Things got off-script during the match, while Yoshiko legitimately attacked and injured Yasukawa, therefore getting stripped of the title and being suspended for an indefinite period. Yasukawa was in a feud with Yoshiko, whom she challenged for the World of Stardom Championship on February 22. The rush continued on February 22, at Stardom Queen's Shout, Kimura and Hudson Envy teamed up and unsuccessfully challenged 7Kairi ( Kairi Hojo and Nanae Takahashi) for the Goddess of Stardom Championship. On February 8, at Stardom Queen's Shout, the unit went for the first time after tag team gold, as Dragonita, Heidi Lovelace and Hudson Envy unsuccessfully challenged Heisei-gun ( Io Shirai, Iwatani and Iroha) for the Artist of Stardom Championship.

The first match under the Oedo Tai name saw Yasukawa, Hudson Envy and Kimura defeating Heisei-gun (Mayu Iwatani, Takumi Iroha and Yoshiko) in a six-woman tag team match on the second night of the Stardom New Year Stars 2015 which took place on February 1. Yasukawa won the Wonder of Stardom Championship the same night after defeating Mayu Iwatani. With Yasukawa and Kimura acting as co-leaders, they rebranded themselves with a Samurai theme due to Act, who was “The Samurai Spirit” of Stardom. The group originally formed after Kimura Monster Gun's Kyoko Kimura, Kris Wolf and Hudson Envy joined forces with Act Yasukawa, Dragonita and Heidi Lovelace following the events of Stardom's 4th Anniversary show on January 18, 2015, defining themselves as the founding members of the unit. The other first co-leader of the unit, Act Yasukawa.
