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Actually 暴雨 was not оnly very attached to his ears, but also had a issue оn 九千勝. 暴雨心奴 is just a code name he gave to himself, his real name is 烈霏. And 霏 stands for “heavy rain”, but this word is literary, formal, and antiqued. (It’s a word parents like to put into their daughter’s name in real life.)) From his childhood, he was a sensitive person with a fragile heart, but also was moody and irritable. He was the оne saved 黃羽客 and treated him like his own family first, but when 烈霖(the father of 暴雨心奴) adopted the latter kid, he started to envy and hate his friend relentlessly.
The family of 暴雨心奴 has a tradition of choose swords(剑) as their prime weapon. So he practiced how to use it many years. He dreamed to become a superhero, which no оne оn the world dares to challenge. So he needed the fame. But unfortunately, the first foe he selected for himself when the first time he left the guard of his parents, was powerful 九千勝. At that time, 九千勝 was honored as the god of saber. (Btw, his name means “I have won the duels 9000 times”.) And undoubtedly, 烈霏 failed in the battle.
Then 烈霏 disappeared, together with his broken dream. When he returned, he had named himself as 暴雨心奴, and he had threw his sword for a long time. He created a new religion (祅撒教) and chose a huge reaping hook as his weapon. He yearned to become the оne who can complete 九千勝 and be acknowledged by 九千勝.
However, 九千勝 already had that оne person, 最光陰. And you can guess the ending of this story. Unsatisfied 暴雨 killed 九千勝, and ripped his ears off.