The following is IGN's guide to the substory Pocket Circuit Fighter! in Yakuza
YAKUZA 0 - How to beat Pocket Circuit Fighter
The Struggling Host - Like a Dragon Gaiden: The Man Who Erased His
Sub Stories - Yakuza 6: The Song of Life Guide - IGN
Yakuza 0 Substories The Fighter's Crown - Pocket Circuit Fighter
Pocket Circuit Fighter! Yakuza 0 - Substory 50 (Kiryu)
Yakuza 0 Friendship Guide
YAKUZA 0 - How to beat Pocket Circuit Fighter
Pocket Circuit Racing - Like a Dragon Gaiden: The Man Who Erased
Yakuza Kiwami Substories Guide All Locations & Walkthrough
The Fighter's Successor, Yakuza Wiki
Pocket Circuit Racing - IGN