Nanae Takahashi
On August 2, 2006, Nanae Takahashi announced that, with the backing of Pro Wrestling Zero1, she was forming a new promotion, named Pro Wrestling Sun, and named Natsuki☆Head as part of the promotion's roster. On September 24, Mizushima announced that she was changing her ring name to "Natsuki☆Taiyo". On December 31, Taiyo made her debut for NEO Japan Ladies Pro Wrestling, defeating Fuka for the Princess of Pro-Wrestling Championship, a title owned by the JDStar promotion. On February 21, 2007, Taiyo defeated Amazing Kong and Toshie Uematsu to win Pro Wrestling Sun's World-1 Women's Championship. She would hold the title for three months, before losing it to Kyoko Kimura on May 27. Shortly afterwards, Taiyo was stripped of the Princess of Pro-Wrestling Championship, after she had not defended the title for three months. While working in Pro Wrestling Sun, Taiyo formed a tag team with Nanae Takahashi, with whom she would also make semi-regular appearances for JWP Joshi Puroresu, with the two unsuccessfully challenging Kayoko Haruyama and Tsubasa Kuragaki for the JWP Tag Team Championship on December 9, 2007.