[6][7] He has no under category experience at all, but he was immediately elected as a senior representative in February 2020 while he was still in the 3rd grade of high school.

He led the team, receiving the runner-up place in the 2020 All Japan Intercollegiate Volleyball Championship, and got the Best scorer award from the competition.

[12] He also played for his college team in the 2021 All Japan Intercollegiate Volleyball Championship, but lost in the quarterfinals against Jutendo University.

[13] On November 29, it was announced that Takahashi would play in the Italian Volleyball League Division 1 with Pallavolo Padova.

On December 19, Ran debuted in the Italian Volleyball League as a substitute in the third set against Modena Volley.

[20] He owns an Instagram account with 2 million followers, a YouTube and TikTok channel with his brother, called RanRui, which is a portmanteau of their given names.