Elementary school sumo wrestlers compete in the sumo ring during a regional tournament of Junior Olympic Cup All-Japan Elementary School Sumo Championship in Kawasaki, south of Tokyo, Japan, October 17, 2021. REUTERS/Kim Kyung-Hoon 

Elementary school sumo wrestlers compete in the sumo ring during a regional tournament of Junior Olympic Cup All-Japan Elementary School Sumo Championship in Kawasaki, south of Tokyo, Japan, October 17, 2021. REUTERS/Kim Kyung-Hoon TPX IMAGES OF THE DAY 

Elementary school sumo wrestler Kyuta Kumagai stands next to other sumo wrestlers as he waits for his match at a regional tournament of Junior Olympic Cup All-Japan Elementary School Sumo Championship in Kawasaki, south of Tokyo, Japan, October 17, 2021. REUTERS/Kim Kyung-Hoon 

Elementary school sumo wrestler Kyuta Kumagai competes in a sumo ring at a regional tournament of Junior Olympic Cup All-Japan Elementary School Sumo Championship in Kawasaki, south of Tokyo, Japan, October 17, 2021. REUTERS/Kim Kyung-Hoon 

Elementary school sumo wrestler Kyuta Kumagai washes his foot after winning in his age group competition during a regional tournament of Junior Olympic Cup All-Japan Elementary School Sumo Championship in Kawasaki, south of Tokyo, Japan, October 17, 2021. REUTERS/Kim Kyung-Hoon 

Elementary school sumo wrestlers compete in the sumo ring during a regional tournament of Junior Olympic Cup All-Japan Elementary School Sumo Championship in Kawasaki, south of Tokyo, Japan, October 17, 2021. REUTERS/Kim Kyung-Hoon 

Elementary school sumo wrestler Kyuta Kumagai warms up as he watches other students' competitions at a regional tournament of Junior Olympic Cup All-Japan Elementary School Sumo Championship in Kawasaki, south of Tokyo, Japan, October 17, 2021. REUTERS/Kim Kyung-Hoon 

Elementary school sumo wrestler Kyuta Kumagai competes in a sumo ring at a regional tournament of Junior Olympic Cup All-Japan Elementary School Sumo Championship in Kawasaki, south of Tokyo, Japan, October 17, 2021. REUTERS/Kim Kyung-Hoon 

Elementary school sumo wrestlers compete in the sumo ring during a regional tournament of Junior Olympic Cup All-Japan Elementary School Sumo Championship in Kawasaki, south of Tokyo, Japan, October 17, 2021. REUTERS/Kim Kyung-Hoon 

Elementary school sumo wrestlers wait for their matches during a regional tournament of Junior Olympic Cup All-Japan Elementary School Sumo Championship in Kawasaki, south of Tokyo, Japan, October 17, 2021. REUTERS/Kim Kyung-Hoon 

Elementary school sumo wrestlers compete in the sumo ring during a regional tournament of Junior Olympic Cup All-Japan Elementary School Sumo Championship in Kawasaki, south of Tokyo, Japan, October 17, 2021. REUTERS/Kim Kyung-Hoon 

Elementary school sumo wrestler Kyuta Kumagai competes in a sumo ring at a regional tournament of Junior Olympic Cup All-Japan Elementary School Sumo Championship in Kawasaki, south of Tokyo, Japan, October 17, 2021. REUTERS/Kim Kyung-Hoon 

Taisuke Kumagai adjusts his son Kyuta's loincloth, called a mawashi, ahead of a regional tournament of Junior Olympic Cup All-Japan Elementary School Sumo Championship in Kawasaki, south of Tokyo, Japan, October 17, 2021. REUTERS/Kim Kyung-Hoon 

Elementary school sumo wrestler Kyuta Kumagai looks at his victory medal after a regional tournament of Junior Olympic Cup All-Japan Elementary School Sumo Championship in Kawasaki, south of Tokyo, Japan, October 17, 2021. REUTERS/Kim Kyung-Hoon 

Taisuke Kumagai pats the head of his son and elementary school sumo wrestler Kyuta Kumagai after Kyuta winning in his age group competition during a regional tournament of Junior Olympic Cup All-Japan Elementary School Sumo Championship in Kawasaki, south of Tokyo, Japan, October 17, 2021. REUTERS/Kim Kyung-Hoon 

An elementary school sumo wrestler cries after losing his match at a regional tournament of Junior Olympic Cup All-Japan Elementary School Sumo Championship in Kawasaki, south of Tokyo, Japan, October 17, 2021. REUTERS/Kim Kyung-Hoon 

Elementary school sumo wrestlers compete in the sumo ring during a regional tournament of Junior Olympic Cup All-Japan Elementary School Sumo Championship in Kawasaki, south of Tokyo, Japan, October 17, 2021. REUTERS/Kim Kyung-Hoon 

Elementary school sumo wrestler Kyuta Kumagai heads to a sumo ring at a regional tournament of Junior Olympic Cup All-Japan Elementary School Sumo Championship in Kawasaki, south of Tokyo, Japan, October 17, 2021. REUTERS/Kim Kyung-Hoon