Mikami competed in DDT from its first event. Initially under his real name and later in all caps as Mikami, he developed the gimmick of an aloof high-flyer, nicknamed "Suicide Boy", who carried a metal ladder to the ring to use it as both a weapon and a jumping platform. In April 2000, after Mikami's return to Japan from a stint in International Wrestling Association, he formed the tag team Suicide Boyz with Thanomsak Toba. Taking inspiration from The Hardy Boyz, which included sleeves similar to Jeff Hardy's, they won the KO-D Tag Team Championship three times.
In 2005, he launched Cruiser's Game, his own brand within Dramatic Dream Team, which focused on junior heavyweight action. It saw the participation of names like Kota Ibushi, Kaz Hayashi, Taka Michinoku, Cima and The Great Sasuke. Cruiser's Game had its final event in 2013, hosting a tournament that was won by Tatsuhito Takaiwa. Two years later, Mikami announced he was leaving DDT.
