Unbeaten Two-Division Champion Aims for Asian Summit Again! Former World Champion Ranked in Four Organizations Faces Crucial Bout… U-NEXT to Stream 'TREASURE BOXING PROMOTION' for Two Consecutive Months

July features Yuya Ozaki's title fight and Taisin Sayuda vs. Junpei Tsujimoto; August showcases Isei Kokubu's world eliminator and three major title fights.

U-NEXT Co., Ltd. (Headquarters: Shinagawa-ku, Tokyo; President & CEO: Tsubasa Tsutsumi) will exclusively livestream 'TREASURE BOXING PROMOTION 13,' scheduled for Wednesday, July 15, 2026, and 'TREASURE BOXING PROMOTION 14,' set for Sunday, August 16, 2026.

The July '13' event centers around a double title fight: the WBO Asia Pacific Light Flyweight title eliminator featuring undefeated southpaw Yuya Ozaki, who previously won two championships undefeated, and the Japanese Super Welterweight title match where #1 contender Junpei Tsujimoto challenges champion Taisin Sayuda.

The following month's '14' event features former IBF Super Bantamweight world champion Isei Kokubu—currently ranked in four major organizations—in a world title eliminator as the main event. Additionally, three of Japan's highest-level domestic title fights will be held simultaneously: a Super Welterweight unification bout, a Middleweight dual-title decider, and the Japanese Light Flyweight title match.

'TREASURE BOXING PROMOTION 13'

[Livestream] Wednesday, July 15, 2026 – All bouts to be streamed live

* Bout start time and livestream start time to be announced later

[On-demand replay] Available from completion of preparation until 23:59 JST, Friday, August 14, 2026

[Viewing page] https://video.unext.jp/livedetail/LIV0000014917

* U-NEXT members can watch at no additional cost (included in subscription).

* For information on compatible viewing devices, please refer to the official site.

[Venue] Korakuen Hall

WBO Asia Pacific Light Flyweight Title Eliminator – 10 Rounds

Yuya Ozaki (World Sports) vs. Jerry Francisco (Philippines)

An eliminator bout between #2-ranked undefeated southpaw Yuya Ozaki [9 wins (7 KOs), 0 losses, 1 draw] and #3-ranked Jerry Francisco [12 wins (4 KOs), 3 losses]. Ozaki, a two-time U-15 national champion during his amateur days, has captured the WBC World Youth title and the WBO Asia Pacific Light Flyweight title as a professional. This marks his first domestic bout since switching gyms, as he aims to reclaim the very title he previously vacated. Francisco, known for his sharp pace changes and explosive bursts at crucial moments, presents a formidable challenge. This highly anticipated clash will determine whether Ozaki can reclaim the Asian summit.

Japanese Super Welterweight Title Match – 10 Rounds

Taisin Sayuda (EBISU) vs. Junpei Tsujimoto (Teiken)

A title defense for Japanese champion and OPBF #2 Taisin Sayuda [9 wins (5 KOs), 2 losses, 1 draw], challenged by #6-ranked Japanese and #1-ranked WBO Asia Pacific contender Junpei Tsujimoto [12 wins (8 KOs), 2 losses, 3 draws]. Sayuda, who transitioned from kickboxing, captured the title in March 2026. A technical boxer known for his unique distance control, unorthodox rhythm, and ring positioning. Tsujimoto, in his 12th year as a pro, makes his first title challenge. Standing 187cm tall, he utilizes a powerful straight right and left body shots. This clash between a champion with unorthodox techniques and a tall challenger is one of the most anticipated bouts of the night.

* All six other bouts will also be livestreamed

'TREASURE BOXING PROMOTION 14'

[Livestream] Sunday, August 16, 2026 – All bouts to be streamed live

* Bout start time and livestream start time to be announced later

[On-demand replay] Available from completion of preparation until 23:59 JST, Friday, September 15, 2026

[Viewing page] https://video.unext.jp/livedetail/LIV0000015024

* U-NEXT members can watch at no additional cost (included in subscription).

* For information on compatible viewing devices, please refer to the official site.

[Venue] Korakuen Hall

Super Bantamweight – 10 Rounds

Isei Kokubu (Kasugano Boxing Gym) vs. Alex Santisima Jr. (Philippines)

A world title eliminator between former IBF Super Bantamweight world champion Isei Kokubu [24 wins (9 KOs), 4 losses, 3 draws], currently ranked in four major organizations, and top Filipino contender Alex Santisima Jr. [13 wins (7 KOs), 2 losses]. Kokubu, known for his high boxing IQ and counterpunching, advanced toward another world title shot with a victory over former world champion Marlon Tapales in April 2026. Santisima Jr., an aggressive boxer-puncher, relies on powerful straight rights and sharp combinations. This crucial bout will determine Kokubu's survival in the world title picture.

WBO Asia Pacific & OPBF Oriental Super Welterweight Unification – 10 Rounds

Ryota Toyoshima (Teiken) vs. So Murakawa (EBISU K’s)

A unification bout between WBO Asia Pacific champion Ryota Toyoshima [23 wins (13 KOs), 3 losses, 1 draw] and OPBF Oriental champion So Murakawa [6 wins (4 KOs), 0 losses]. Toyoshima, a former two-time Asian champion at welterweight, is now ranked WBA #11 and WBO #14 in the super welterweight division. Murakawa, a rising star ranked WBC #27, transitioned from kickboxing to professional boxing and captured the OPBF Oriental title undefeated. This clash between a proven powerhouse and an undefeated rising champion will determine Asia's strongest super welterweight.

WBO Asia Pacific & Japanese Middleweight Dual-Title Decider – 10 Rounds

Shito Takezako (World Sports) vs. Itto Kawabuchi (ABC Boxing)

A dual-title bout between Japanese champion and WBO Asia Pacific #5 Shito Takezako [19 wins (15 KOs), 3 losses, 1 draw] and #1-ranked Japanese contender Itto Kawabuchi [4 wins (3 KOs), 0 losses]. Takezako, a former OPBF champion known for his high KO ratio, reclaimed the Japanese title in March 2026. Kawabuchi, a southpaw ranked OPBF #11, boasts a strong amateur background including national high school championships. Armed with a devastating straight left, he aims for his first title win while remaining undefeated. This highly anticipated bout pits a proven power puncher against an undefeated rising star.

Japanese Light Flyweight Title Match – 10 Rounds

Daiki Kameyama (Watanabe) vs. Namizuki Ohashi (Shonan Ryuken)

A title defense for Japanese champion and WBC #17 Daiki Kameyama [13 wins (3 KOs), 8 losses, 2 draws] against #13-ranked challenger Namizuki Ohashi [10 wins (7 KOs), 6 losses, 1 draw]. Kameyama, known for relentless volume punching and toughness, recently captured the title in April 2026. Ohashi, a boxer-puncher with fast and sharp straight rights, makes his second title challenge after a loss in his first attempt in December 2024—his first shot in nearly 1 year and 8 months. This tense title defense features two fighters with history over the former champion, adding extra drama.

* All other bouts will be livestreamed

About U-NEXT

U-NEXT is Japan's #1 video-on-demand service by number of unlimited-viewing titles. With over 420,000 titles including movies, dramas, and anime, plus live streaming of music concerts, stage performances, and world-class sports such as soccer, golf, and combat sports, U-NEXT delivers premium entertainment. Additionally, over 1.24 million manga and books are available. Through a single app, users enjoy seamless access to 'Video,' 'Books,' 'Sports,' and 'Live' content, offering a genre-crossing entertainment experience. In July 2023, U-NEXT merged with Paravi and