Tsujiko made his car racing debut in 2021, racing for
Ponos Racing in select rounds of the
Formula Regional Japanese Championship. Racing at
Okayama and
Suzuka, Tsujiko scored a best result of 12th in both rounds. During 2021, Tsujiko also participated in the season-opening round of the
Super Taikyu Series at
Motegi with Comet Racing in the ST-Z class. The following year, Tsujiko returned to
Formula Regional Japan with
Ponos Racing, whilst also entering
GT World Challenge Asia with Comet Racing. In the former, Tsujiko scored a best result of seventh in race one at
Okayama and finished 12th in points. In the latter, Tsujiko scored an overall win at
Suzuka and five class podiums to secure third in the Am standings. Remaining with Comet Racing for 2023, Tsujiko raced with the team in both
GT World Challenge Asia and the
SRO Japan Cup, whilst also returning to
Ponos Racing for a part-time schedule in
Formula Regional Japan. In GTWC Asia, Tsujiko scored an Am class win at
Fuji and once again finished third in the class standings, whereas in Japan Cup, Tsujiko secured seventh in the overall standings with a best result of fourth in the same race. In Formula Regional Japan, Tsujiko scored a best result of fifth in race two at
Fuji and ended the year 13th in points. During 2023, Tsujiko also made his
24 Hours of Le Mans debut, racing in the LMGTE Am class for
Kessel Racing alongside
Kei Cozzolino and
Naoki Yokomizo. In the race, the trio finished ninth in class. For 2024, Tsujiko remained with
Ponos Racing to race in both the
Formula Regional Japanese Championship and
Porsche Carrera Cup Japan, whilst also continuing in the
SRO Japan Cup with Comet Racing. In the former, Tsujiko took his maiden series podium by finishing third in race three at
Okayama, whereas in Carrera Cup Japan, he scored a best result of ninth at the same venue. Racing in the Am class in Japan Cup, Tsujiko won both races at
Suzuka in class and scored one more overall podium to finish runner-up in the Am standings. In 2025, Tsujiko remained in the
SRO Japan Cup as
Ponos Racing entered the series and also partook in the
Suzuka 1000 km with the same team. In Japan Cup, Tsujiko won at
Okayama and
Suzuka on his way to runner-up in both the GT3 overall and Pro-Am standings. Tsujiko remained with
Ponos Racing, which ran in a collaboration with K2 R&D, to race in the
2025–26 Asian Le Mans Series for his debut in endurance prototypes, in which he competed in the LMP2 class. Following the demise of the K&2 partnership ahead of the UAE rounds,
United Autosports maintained the team's cars for the final two rounds, in which Tsujiko scored his only points of the season at the finale in
Abu Dhabi. For the rest of 2026, Tsujiko remained with his team to continue in the
SRO Japan Cup. == Racing record ==