[3] He played his junior rugby league for Townsville Brothers and attended Ignatius Park College before being signed by the Brisbane Broncos.
[4][5][6] In 2021, Shibasaki played for the Townsville Blackhawks in the under-16 Cyril Connell Challenge competition, scoring four tries in four games.
[7] In 2022, he moved up to their under-18 Mal Meninga Cup side, starting at second-row in their Grand Final loss to the Souths Logan Magpies.
[11][12] In May 2023, Shibasaki, aged just 17 years and 339 days, made his Queensland Cup debut for the Blackhawks in their 54–4 win over the PNG Hunters.
[14] On 17 September 2023, he started at second-row in Townsville's under-21 Colts Grand Final win over the Brisbane Tigers.