Arai is a younger brother of Takahiro Arai of Hiroshima, 34 years old in the 12th year professional. I joined Komazawa University on Sunday in 2006 and transferred to Hanshin by trade off in 2010. In the Heisei 24 season I was bought a long banging power and a good batting, I played 110 games and batting rate 20% 8 minutes, marking 11 home runs and in the next year's season I got 4 He was appointed and played 119 games and hit 14 home runs, which was his highest number. However, after that the grades declined gradually due to the effects of injuries and others, and this season had received the emergence of young people, only 16 games have been played so far.

Because of this, Arai decided to retire in the season as soon as possible and will hold a press conference on 11th and officially declare retirement.