Cepeda, who was invited to be a last-minute replacement for Rob “Che’lu Zombie” Wusstig of Guam, lost by way of submission straight armbar against Omigawa (14-14, with four KOs) in the 62-second mark of the first round.
He now holds a 1-2 record.
The 150-lb fighter, representing ZengZung Tinian, previously lost via submission against Aaron Magbuhat of Guam (4-7, with one KO) in Rites of Passage: Unstoppable two years ago.
Cepeda travelled with cornerman Reno Reyes and Jayson Tarkong.
Wusstig, who is the reigning Trench Tech featherweight champion, sprained his ankle, forcing organizers to invite Cepeda.
Wusstig won the Trench Tech 145-lb title after dealing Shane “Pikaboo” Alvarez (10-1, with three KOs) his first loss in Trench Warz 15: Supremacy on Dec. 16, 2011.
The Cepeda-Omigawa bout was the 11th fight of a 13-match fight card that saw Yuki Motoya (12-4, with four KOs) beating Tatsumitsu Wada (11-8, with two KOs) by submission via rear-naked choke with 45 second remaining in the second round.
In other results, Kazunori Yokota 21-5, with four KOs) used a Kimura in forcing compatriot Yusuke Kagiyama (16-10, with six KOs) to tap out in the 2:38-mark of the first round, Masakazu Imanari (28-13 with one KO) defeated South Korean Chan Jun Park via submission heel hook, while Toshiaki Kitada (17-87, with three KOs) only needed a first-round technical KO against Jeung Geun Gyun (0-1).
Yuya Shibata (10-2) scored a unanimous decision win over Kota Ishibayashi (5-8), the match between Yoichi Fukumoto (15-9, with one KO) and Yukinaki Tamura (15-10-1) ended up in a draw, Yasuaki Kishimoto (16-6, three KOs) used an armbar submission in beating knockout specialist Juri Ohara (13-8, with nine KOs).
Sota Kojima (14-5, with two KOs) completed a unanimous decision win over Jae Kyung Kim, Kimihiro Eto remained undefeated after six fights after forcing Takaaki Aoki’s (4-6, two KOs) corner to throw in the towel by TKO, which is the same result in Yuma Horiuchi’s (2-1, with one KO) victory over Yuya Kodama (0-3) by way of punches.
Kodi Morata (2-2) and Akito Mitoma (1-0) also defeated separate opponents by decision. Morata downed Yuki Takano (1-1) while Mitoma bested Liger Narita (2-6). (Jon Perez)