I dunno, 5 minutes worth of Oh my over the course of 48 episodes and 6 movies.
Seems legit enough.
Also, this guy is a badass:
Kunugi Renya Human race , Age:94
Current resource file number: 9201-0846-2525-4985
former world number: 8190-9753-1414-3878
No special events mentioned 14th family head of kunugi one sword flow style.
An accomplished kendoist since childhood, at the age of 13 he takes up swordsmanship, hence allowing his talent to bloom. At 15 years old, moved to mainland China for warrior training by taking part in the underground society. He killed a large number of people using a single sword, hence was called by the nickname of “sword demon“ (T: ken no oni) The number of people he killed in the underground society activities caps at 912 people in five years. Then, he served in World War II.
The number of people he killed during the war period of four years was 3712 people. The number of people he killed during the war period of four years with his blade alone was 3712 people. Hence the name, “Blade ogre“.
After the war, became the next family head of Kunugi one sword flow style, spent time training and learning other sword styles. Carried out performances of swordsmanship through demonstrations in various places, and quickly made the Kunugi one sword flow style widely known which lead to having 49 dojos in japan and abroad.
In His later years became a swordsmith, having the inscription of “ka Ren”(lotus petal), was known as the human national treasure. Also was a known gourmet, had a high affinity for cuisine. lived to the age of 94 years and 127 days, and died of old age. Life Kills, 5730 people.