He won four consecutive races at Twin Ring Motegi and Fuji, and eventually finished second in the championship to Nissan prospect Daiki Sasaki.

[citation needed] After the season, a dissatisfied Hiramine told Honda that he planned to stop racing.

[2] His only professional race was a one-off cameo in the Super Taikyu Series finale at Autopolis, where he won the ST-4 class in a Honda S2000 entered by Tracy Sports.

After spending most of 2014 out of racing, Hiramine made his Super GT debut in the 2014 Suzuka 1000km, as a third driver for JLOC in their number 88 Lamborghini Gallardo GT3.

He became a full-time GT300 driver beginning in 2015, partnering two-time series champion Manabu Orido in JLOC's flagship number 88 team.

While at JLOC, he also entered the Lamborghini Super Trofeo Asia series on a part-time basis, and won the Pro-Am class in race one of the 2015 round at Sepang Circuit.

In 2018, he entered the inaugural Suzuka 10 Hours with JLOC, partnering Mapelli and fellow Lamborghini factory driver Andrea Caldarelli in a Pro class car sponsored by EVA Racing (Run'A Entertainment).

Driving the newest generation of the Nissan GT-R NISMO GT3, Kondo Racing had a successful first GT300 campaign.

While they struggled early in the season, Hiramine did capture his first GT500 podium by finishing second in the sixth round of the championship at Suzuka.

In 2021, Sasaki moved to Kondo Racing, and Nobuharu Matsushita, the former GP2 Series/FIA Formula 2 driver, made his GT500 debut with Nissan and Team Impul.

At the penultimate round at Motegi, Hiramine was leading on the final lap, but ran out of fuel and dropped to third place.