When Yuchi first met Medusa, he had been at the peak of his lunacy, in a sense.
At that time, he had not realized it, but fishing in the Netherworld Sea had its effects.
Those ancient beings were dead spirits, and these dead spirits had a powerful ability to corrode and contaminate the souls of living people.
Yuchi, who had just arrived at the Netherworld Sea prison, had not been strong at all, and his soul was even weaker. Therefore, he lost the ability to control his emotions due to the contamination of these ancient beings.
From time to time, a malicious desire to fight and kill would appear in his heart, which made him want to kill others, and at times himself. This led to him trying his best to find satisfaction in battle, which gave birth to his twisted personality.
Those ten years had shaped his current personality.
