02/11/2025
The below article is an interview feature from the magazine series *Knuckles Great Figures* titled “The Truth Behind the Cow Killer,” regarding Masutatsu Oyama, by his student Yoshiji Soeno (the renowned karateka known as the “Fierce Tiger of Kyokushin.”)
The Truth Behind the “Cow Killer”
The Founder of Kyokushin Karate - Masutatsu Oyama, as told by his direct disciple, Yoshiji Soeno
Written by Dr. Samurai
Photos courtesy of Yoshiji Soeno, Nikkan Sports / Aflo
Masutatsu Oyama, known as “The Godhand,” was a man who felled bulls and spread full-contact karate across the world. Yoshiji Soeno, his direct disciple—who spent his youth under Oyama’s strict guidance—recounts the unknown strength, compassion, and frailty of his master.
“Fight for Real”—Training Was Brutal
“When I first saw Oyama sensei, everything about him—from his presence to his build—reminded me of Rikidōzan. I was 16, a first-year high school student at the time,” recalls Soeno.
In 1964, Soeno walked into the doors of Oyama’s dojo, when it was still called simply *Ōyama Dōjō*, before it became *Kyokushin Kaikan.* Oyama was already known nationwide as “The Seventh-Dan Cow Killer.”
“He was the kind of man who’d say, ‘If you don’t actually hit, it’s worthless! Go fight!’ Philosophy came second to action. There was no such thing as *sun-dome*—pulling punches short. Every strike, every kick was real.”
The Legendary Strength of Mas Oyama
“Oyama sensei was unbelievably strong. His punches carried such force that you could feel the wind from them. During training camps, even at arm wrestling, no one could beat him. His strength was inhuman—he could literally snap a bull’s horn.”
“The story about him bending ten-yen coins? That was real. I saw him bend three coins right in front of me. He studied everything—karate, judo, iaido, aikijujutsu, joint locks, even pro wrestling. He’d stay up late into the night, experimenting and grunting in practice.”
Breaking Bricks and Beer Bottles
Oyama added creative twists to karate’s traditional tameshiwari (breaking demonstrations). He pioneered the two-layer brick break—requiring not just power but perfect timing and speed—and even performed live “beer bottle cuts,” using the edge of his hand to shatter the neck clean off a glass bottle. These feats captured global attention.
He authored the books *What is Karate?* (1958) and *This is Karate* (1965), spreading the art internationally. “In France, people even made pirate copies. He was truly remarkable,” notes Soeno.
Conflict with Manga Creator Ikki Kajiwara
In 1970, Soeno debuted in a karate match against a Thai fighter at Ōta Gymnasium but lost. “I thought he’d scold me for losing, but Oyama sensei just said, ‘I’ve lost too—in boxing. Don’t worry about it.’ It surprised me that he’d admit such a thing. That was the first time he ever spoke to me so kindly.”
However, Oyama’s attitude could change quickly. “Before a match against a rival school’s fighter, he told me, ‘You carry the Kyokushin name—you can’t lose!’ That was just like him.”
Things began to shift when manga creator Ikki Kajiwara began serializing *Karate Baka Ichidai”. “The attention and money that came with the manga’s success caused tension. Oyama sensei became jealous when others like Ashihara or I got close to Kajiwara.”
The Break with Kyokushin
In 1980, both Ashihara and Soeno were expelled from Kyokushin for political and organizational reasons. “Once I had founded Shidōkan, there was no turning back. But I never held resentment. I always saw Oyama sensei as my teacher.”
Years later, he unexpectedly saw Oyama again at a sauna in Kōrakuen. “I shouted at him—‘Why did you expel me?’ He just looked down silently.”
Still, Oyama had taught him “to pursue the essence of truth” and believed that “the warrior (budōka) and the honorable outlaw (kyōkaku) spring from the same root.” He loved Musashi Miyamoto and would retreat to Sanpō Shrine to train.
Oyama’s Final Words
Oyama passed away from lung cancer on April 20, 1994, at the age of 70. Soeno recalls, “When I heard from Shinya Ōishi that Sensei had died, I rushed to the Ikebukuro headquarters dojo. I think I cried the hardest of all. That dojo was where I sweated as a teenager—it brought back everything.”
Oyama had even left the hospital a month earlier to attend the wedding of Ikki Kajiwara’s son, laughing, “I escaped from the hospital.” None could imagine he’d be gone so soon.
At his Shinto funeral, Soeno reflected on Oyama’s words: “At night, I see the faces of all my disciples. I always think of you as my child.” “He probably said it to please me,” Soeno smiles, “but half of it was genuine. He was simple, emotional, and lonely. There will never be another person like him.”
Soeno still keeps Oyama’s ashes, given to him by Oyama’s wife. “I’m the only disciple who has them. He wasn’t a god or just a legend. He was human—strong, kind, and fragile. My life’s teacher.”
Timeline of Masutatsu Oyama
| Year | Event |
|------|--------|
| 1923 | Born June 4 in Kimje, Jeolla Province , Korea (then part of Japan) |
| 1943 | Enrolled at Yamanashi Aviation School |
| 1946 | Won Japan’s first postwar karate championship |
| 1948 | Began 18 months of mountain training at Mount Kiyozumi |
| 1950 | Fought and killed bulls in Tateyama, Chiba |
| 1952 | Performed and taught across 32 cities in the U.S. |
| 1954 | Opened Ōyama Dojo in Mejiro, Tokyo |
| 1964 | Established Kyokushin Headquarters in Ikebukuro |
| 1971 | Karate Baka Ichidai manga began serialization |
| 1975 | Hosted first World Open Karate Tournament |
| 1994 | Died of lung cancer, age 70 |
Yoshiji Soeno Biography
Born in 1947. Joined Ōyama Dojo (now Kyokushin Kaikan) in 1964. Runner-up in the 1st All-Japan Karate Championship. After years of overseas training, he founded the World Karate Association Shidōkan in 1981, which now has branches in dozens of countries.