Zongman: the Wraith Imp

The protagonist with strange symptoms died on the street one day. He felt resentful and traveled to the world of One Piece. Every time he kills a person, his power will become stronger, and a female protagonist will also come through, trying to solve the resentment. Can 10 years of resentment be quelled? Or will the disaster continue to escalate? This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.