[4] Ikoma made his debut aged 31, during Shooto - To The Top 5, when he faced Homare Kuboyama in the 123 lbs category.
Ikoma lost a UD when he faced Robson Moura, won against Ichaku Murata by a triangle choke.
Over the next two years he achieved a 1-3-2 record, but was nonetheless given a chance to fight for the Shooto World Flyweight (114 lb) Championship, after Rambaa Somdet vacated the title, following a left biceps injury.
[5] Ikoma won his first major career title at the age of 41, ten years after his pro debut.
Junji Ikoma's last fight was in 2012, when he lost against Tadaaki Yamamoto, through a second round rear naked choke.