[2] Hachimura was born on February 8, 1998, in Toyama Prefecture, Japan, to a Japanese mother, Makiko (麻紀子) and a Beninese father, Zakari Jabil.

[10][11] On December 29, 2015, Hachimura posted 34 points, 19 rebounds and three blocks to guide Meisei past Tsuchiura Nihon University High School for his third All-Japan Tournament victory.

[16][17] In May 2016, Hachimura announced that he met the SAT and GPA requirements to be eligible to play at Gonzaga beginning as early as fall 2016.

[18] Sources: Hachimura made his regular season debut for the Gonzaga Bulldogs on November 11, 2016,[19] against Utah Valley, recording one point and three rebounds in four minutes.

[22] Hachimura scored eight points on February 23, 2017, against San Diego, helping his team win the West Coast Conference (WCC) title.

[23][24] On March 16, 2017, after playing one minute against South Dakota State, he became the first Japanese native to ever appear in the NCAA Division I men's tournament.

[35] On October 23, 2019, Hachimura made his NBA debut, posting a double-double (14 points, 10 rebounds) as a starter in a 100–108 loss to the Dallas Mavericks.

[36] On December 1, 2019, Hachimura scored a then career-high 30 points in a 125–150 loss to the Los Angeles Clippers along with nine rebounds, three assists and a steal.

[38][failed verification] Hachimura suffered a groin injury against the Detroit Pistons on December 16 and had surgery and missed several games.

[48] On January 21, 2023, in his last game before being traded, Hachimura recorded a then career-high-tying 30 points, alongside five rebounds and two blocks, in a 138–118 win over the Orlando Magic.

[49] On January 23, 2023, Hachimura was traded to the Los Angeles Lakers in exchange for Kendrick Nunn and three second-round draft picks.

[50] Hachimura made his Lakers debut two days later, recording 12 points and six rebounds in a 113–104 win over the San Antonio Spurs.

At the 2013 FIBA Asia U16 Championship in Iran, he averaged 22.8 points, 12.6 rebounds and 2.8 blocks through eight contests,[56] guiding his team to a third-place finish.

[60] Japan finished the 2014 FIBA U17 World Championships 14th of 16 teams, with Hachimura scoring a tournament-high 22.6 points per game, while pulling down 6.6 rebounds and blocking 1.7 shots per contest.

[62][25] Hachimura competed for Japan in the 2017 FIBA Under-19 Basketball World Cup, averaging team-bests 20.6 points and 11.0 rebounds a contest.