Takumi's interest in baseball started when he was 3 as he played catch with his dad in the suburbs of Marugame City.

A week later, he managed to pull through his next start against the Swallows and earned his first career win, a feat that was last achieved by a high-school drafted Hanshin rookie 24 years ago by Shōji Tōyama in 1986.

During postseason, he was loaned to the Canberra Cavalry to play in the Australian Baseball League together with teammates Fumiya Araki and Yuhei Kai.

He struck out 16, gave up 13 hits, 10 walks and 3 earned runs (1.05 WHIP) in 22 innings before going back to Japan.

[8] 2012 to 2016 Akiyama spent most of the next four years in the minors pitching in Western League games, with only a handful of main squad appearances.

He did get to pitch in the 2014 NPB Tigers-Giants Union vs MLB All-Star during post-season, where he gave up 1 solo homerun in 1 inning.

[10] He had two quality starts in 2015 but the succeeding relievers failed to hold the fort, and for the 3rd time in a row, Akiyama ended the season without a single win.

He got called to the main squad as a reliever for a couple of outings in August, and was returned to the starting rotation in September.

[17] Post-season, he and Masahiro Nakatani were given the 2017 Tomoaki Kanemoto Fresh Award during fan appreciation day on November 25, and received 5 million yen each.

Despite allowing 5 runs, he notched a complete win against the Swallows on July 28, almost two and a half years since he last accomplished this feat in May 2018.

[27] His pitching picked up after this and he produced 6 quality starts out of 7 outings in the following weeks (6 earned runs, 1.25 ERA).

In spite of this however, the team's hitting slump coupled with fielding errors, some he committed himself, only earned him 3 wins until the end of September.