While in attendance at the 2017–18 Japan Championships, Takahashi met Mie Hamada and soon moved from Kanagawa to Takatsuki, Osaka to train under her at the Kansai University Skating Club.

[7] Making his international debut on the 2024–25 ISU Junior Grand Prix circuit, Takahashi won the gold medal at 2024 JGP Latvia.

[11][12] In late November, Takahashi competed at the 2024–25 Japan Junior Championships, where he won the silver medal behind Rio Nakata.

[14] At the 2024–25 Junior Grand Prix Final in Grenoble, France, Takahashi placed sixth of the six competitors in the short program after missing his opening triple axel and failing to perform his jump combination.

[15][16][17] Following the event, Takahashi would admit to being "very anxious and nervous" during the short program but that he was pleased with his free skate performance, saying, "I'm happy because I didn't give up until the end... Time just flew by, and I was having so much fun that I was concentrating.

"[18] Two weeks later, Takahashi finished fourteenth at the 2024–25 Japan Championships and was subsequently named to the World Junior team.