WBA flyweight champion Daiki Kameda said Monday he has decided to relinquish the belt to fight in a heavier division.

"I know I'll just cause trouble for people around me if I stay at flyweight," Kameda told a press conference a day after he won a split decision over 14th-ranked Romanian Silvio Olteanu in his second title defense.

"At flyweight, my body is screaming. I'm just going to a weight class where I can move most quickly," he continued.

The second eldest of the three Kameda boxing brothers will move up to the super flyweight or bantamweight division, having struggled to make the flyweight limit.

His Kameda Gym plans to begin the procedures to relinquish the 21-year-old Daiki's title in early January.

Meanwhile, Koki Kameda, the eldest brother, expressed excitement over his history-making win over former WBA super flyweight champion Alexander Munoz on Sunday night.

Koki defeated the Venezuelan by unanimous decision to claim the vacant WBA bantamweight crown and become the first Japanese boxer to win world titles in three weight classes.

"Winning world title belts in three different weight classes was my dream since I was a little kid, so I'm thrilled," Koki said. "I don't have weight problems at bantamweight. So at this point, I want to defend the bantamweight title several times."

The 24-year-old added that his next match is expected to be around April.