Naoki Inoue (born June 14, 1997) used to be known as "Mizuki's Younger Brother" but this changed in 2017 when he signed with the UFC, becoming the youngest Asian to sign with world's best MMA promotion.

Naoki, when he was a first-grader, began training MMA at Hakuhsinkai Karate in Toyohashi, Japan.

Naoki made his pro MMA debut at age 18, won DEEP Future King Tournament, followed by winning ten fights in a row before getting a call from the UFC.

Naoki made his promotional debut on June 17, 2017 at UFC Fight Night: Holm vs. Correia against Carls John de Tomas. At the weigh-ins Carls John de Tomas came in at 131 lbs, five pounds over the flyweight limit of 126 lbs. As a result, he was fined 30% of the purse, which went to Naoki, and their bout proceeded as scheduled at a catchweight. Inoue won the fight by unanimous decision (30-26 X 3).

Naoki faced Matt Schnell on June 23, 2018 at UFC Fight Night 132. He lost the fight via split decision.

Naoki posted a record of 1-1 in the UFC, however, due to the Zuffa's decision to decrease number of flyweights, he was released from the contract.

Naoki is now fighting for the RIZIN Fighting Federation currently posting 5-1 record in Japan's biggest MMA promotion.

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MMA record: 15-3-0 / height: 5'9" (175 cm) / weight: 135 lbs (61.2 kg)