The WBA champion returns to the ring for the first time in two years against a successful, battle-tested opponent.
The host nation earned three marathon medals, with Misato Michishita winning the women's T12 race, while Daiki Kajiwara, Sarina Satomi and Yuma Yamazaki collected badminton golds.
The Tokyo native adds to Beijing, London titles to solidify his place as one of Japan's greatest Paralympians.