With 2003 and 2004 being mostly uneventful for Sekimoto, he started 2005 with a bang by winning the New Generation Battle Tournament by defeating HERO! in the final on January 9. Over the years, Sekimoto would compete in numerous variations of hardcore matches including barbed wire board tag team death match, Fluorescent Lighttubes tag team death match and prison hall Death match, he also competed at RIKI-PRO and Apache Pro Wrestling frequently. On October 14, Sekimoto teamed up with Abdullah Kobayashi to win his second BJW Tag Team Championship. 2006 would start on a low point as Sekimoto and Kobayashi lost the titles to Mammoth Sasaki and Shadow WX on January 27. Sekimoto and Tomohiko Hashimoto took part in the WEW Tag Team Title Tournament but wouldn't go past the first round. On December 3, 2006, Sekimoto and Yoshihito Sasaki defeated Mammoth Sasaki and Shadow WX for his third BJW Tag Team Championship. During their four hundred plus days as champions, Sekimoto took on Mammoth Sasaki for the WEW Heavyweight Championship in February 2007. On March 2, Sekimoto and Sasaki lost the BJW tag Team Championship to Kengo Mashimo and Madoka at a Pro Wrestling Zero1 event. With this loss, Sekimoto teamed up with Katsumasa Inoue to take on GAINA & Zero for the Osaka Pro Wrestling Tag Team Championship but lost. Sekimoto and Inoue teamed up once again and took on Handsome Joe and Taka Michinoku for the Strongest-K Tag Team Championship. During a joint event between Big Japan and El Dorado Pro Wrestling, Sekimoto teamed up with Shuji Kondo and defeated KAGETORA and Takashi Sasaki to win the Thanksgiving Day Tag Tournament. On July 13, 2008, Sekimoto and Mammoth Sasaki defeated Kengo Mashimo and Madoka for the BJW Tag Team Championship, however, on March 7, 2009, Saksaki was injured in an auto mobile accident and vacated the championship. In the Maximum Tag League 2009, Sekimoto and Masato Tanaka finished top of block B but would lose to Takashi Sasaki and Yuko Miyamoto in the semifinal. On July 27, 2009, Sekimoto and Yuji Okabayashi defeated Isami Kodaka and Masashi Takeda to win his fifth BJW Tag Team Championship. A month later, Sekimoto won the Eight Man Tag Team Tournament with Shinya Ishikawa, Yoshihito Sasaki and Yuji Okabayashi. On December 13, 2009, Sekimoto and Okabayashi lost the titles to Yoshihito Sasaki and Shinya Ishikawa. 2010 kicked of with a loss at Osaka Pro Wrestling when Sekimoto and Okabayshi lost Hideyoshi & Masamune in a match for the Osaka Pro Wrestling Tag Team Championship. On February 28, 2010, Sekimoto defeated Shuji Ishikawa for the KO-D Openweight Championship. After several defences, he lost the title to Harashima on July 25. He would return next year in the same month to take part in a four-way elimination match for the KO-D Tag Team Championship and teamed with Masa Takanashi and won. They would lose the title on August 28 to Danshoku Dino and Kota Ibushi. Sekimoto began teaming with Yoshihito Sasaki to take part in the BJW Tag Team Championship Tournament and reached the final, which took place on April 28, 2010, and lost to Jaki Numazawa and Jun Kasai. On October 10, Sekimoto and Sasaki defeated Numazawa and Kasai to become a six time BJW Tag Team Championship but would lose the title to Numazawa and Kasai. Sekimoto and Kazuki Hashimoto took part in a year long tag tournament called Dainichi-X 2011 but would not gain enough points to progress to the semifinal. Sekimoto and Yuji Okabayashi took part in the Big Japan Tag League 2011 and won. In March 2012, Sekimoto participated in the Ikkitousen Strong Climb Tournament in block A and reached the final before losing to Yoshihito Sasaki. On August 22, Sekimoto defeated Kengo Mashimo for the Strongest-K Championship and lost it Yuji Hino on November 13. On September 8, 2013, Sekimoto worked the inaugural event of the Wrestle-1 promotion, which Keiji Mutoh formed after leaving All Japan. Teaming with his regular partner Yuji Okabayashi, the two defeated Kaz Hayashi and Shuji Kondo in a tag team match.