In 1998, Kasai made his debut in aBig Japan Pro Wrestling (BJW) event inOsaka during the Deathmatch Wrestling boom of the late 90s. As BJW established a working relationship with American promotionCombat Zone Wrestling (CZW) at the turn of the millennium, Kasai joined the stable "CZW Warriors" (CZW Army) and feuded against the "BJW Warriors". Kasai formed the stable "Big Dealz" in 2001, withJohn Zandig,Nick Mondo,Wifebeater, Z-Barr andTrent Acid.[1]
Kasai has participated five times in an extremely bloody "Razor Deathmatch"; a hardcore match where boards are fitted with manyrazor blades. The first of these deathmatches was held in 2005 withJaki Numazawa, in which Jun took apowerbomb onto the razor bladed board. In the second one, held in 2008, Kasai's match was against the American wrestlerMasada. On November 20, 2009, he defeatedRyuji Ito in another razor match after a double underhook facebuster on acactus.
The fourth time was on April 5, 2010 where Kasai competed in a Barbwire Treaty Death Match that pitted Team CZW (Kasai,D. J. Hyde andNick Gage) against Team BJW (Jaki Numazawa,Isami Kodaka andMasashi Takeda) in which a razor blade board was used in several bumps. On June 21, 2010 Kasai competed against theNecro Butcher in a Hardcore match for theFreedoms promotion; the razor blade board came into play mid way through the match.
In 2012, Kasai teamed regularly with American pro-wrestler/rapper One Man Kru. Together, they defeated the team ofThe Great Sasuke andKesen Numajiro in a fluorescent light tubes death match at the September 9, 2012 Freedoms event in Iwate, Japan.
Kasai is married to his wife Michiyo; the couple have a daughter together.[10] Kasai also has a son, Hinata, from a previous relationship. In July 2025,DDT Pro-Wrestling revealed Hinata had been training for them. He made his debut the following month atWrestle Peter Pan 2025.
He was born inHokkaido and now lives in themainland, but claims on his official website that he is from "Hiladelhia,America" as a joke;[11] he has described Philadelphia as his second homeland. While Kasai wrestled in the United States, he was a lodger inMatthew Prince, better known as the wrestler Wifebeater's house. He has described Prince as a real madman, unlike many deathmatch wrestlers who are in fact gentlemen outside the ring.[12]
Kasai is the subject of a documentary called Kyo-En. The documentary was released in 2021. In 2025, videogame creatorHideo Kojima praised the film.[13]
Since 2005, there have been "razor blade board" deathmatches in BJW, Apache Pro Wrestling and Freedoms, and all of them have involved Kasai.InPro Wrestling Freedoms, Kasai is a formerKing of Freedom World Champion
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