Nanae Takahashi
On September 7, 2010, at a press conference, where Nanae Takahashi unveiled her new World Wonder Ring Stardom promotion, Taiyo was announced as part of the promotion's roster. The promotion's debut event on January 23, 2011, saw Taiyo team up with Yuzuki Aikawa in the opening tag team match, where they were defeated by the team of Iris and Nanae Takahashi. Later that same event, Taiyo worked under a mask and the ring name Passion Nakki, facing nine-year-old Haruka in a three-minute exhibition match. The following month, Taiyo formed the tag team Kawasaki Katsushika Saikyou Densetsu with the recently debuted Yoshiko, the two defeating Iris and Yoko Bito in their first match together. Taiyo's and Yoshiko's win streak was ended on May 29, when they were defeated by Nanae Takahashi and Yoko Bito. Also in May, freelancer Yuu Yamagata aligned herself with Taiyo and Yoshiko, forming the stable Trouble Maker 2. On July 24, Taiyo defeated JWP representative Leon to regain the former NEO High Speed Championship, which was then, as a result, adopted by Stardom as one of its championships. On October 10, Taiyo and Yoshiko entered the Goddesses of Stardom Tag League. On October 27, Taiyo represented Stardom in Sendai Girls' Pro Wrestling's Joshi Puroresu Dantai Taikou Flash tournament, a single-elimination tournament, where different "joshi" promotions battled each other. In their first round match, Team Stardom (Taiyo, Mayu Iwatani, Saki Kashima, Yoko Bito and Yoshiko) defeated Team Reina (Aki Kanbayashi, Aoi Ishibashi, La Comandante, Yumiko Hotta and Zeuxis). The semifinals of the tournament were contested in six-woman tag team format and saw Team Stardom (Taiyo, Bito and Nanae Takahashi) defeat Team Diana (Kaoru Ito, Kyoko Inoue and Sareee). However, in the finals, the Stardom duo of Takahashi and Yoshiko were defeated by Team Sendai's Kagetsu and Meiko Satomura. On November 12, Taiyo unsuccessfully challenged Nanae Takahashi for the World of Stardom Championship. When the Goddesses of Stardom Tag League concluded on November 27, Taiyo and Yoshiko finished with two wins and one loss, making it to the finals of the tournament, where they were defeated by Yuzuki Aikawa and Yoko Bito, whom they had defeated earlier in the tournament.