Arai

is a prisoner in Hōzuki Castle.

Personality
Arai is shown to be very laid-back individual. Friendly to new prisoners in Hōzuki Castle, he gladly shows them around and explains its inner workings.

Appearance
Arai is a tall and lanky man of fair complexion. He has yellow eyes and red bushy hair. Like the other prisoners of Hōzoki Castle, he wars a red prison jumpsuit.

Mujina Bandits Arc
When Boruto Uzumaki and Mitsuki were sent to Hōzuki Castle as its newest prisoners (secretly as a part of an official mission), the two boys were made cellmates with Arai and his other cellmates, Kedama and Kamata. He explained the layout of the prison to Boruto and Mitsuki. Later, they asked about the rumours of Tsukiyo, the second-in-command of the Mujina Bandits was really here as well. Arai explained that he was in solitary confinement after assaulting the prisoner Kokuri. As Arai off-handled noted that Kokuri was lucky to be administered to the well-accommodated hospital wing for such simply injuries, Boruto asked how to get in himself.

Arai said the only safe way to get in without the doctors seeing through the ruse is to eat a poison white berry of one of the Chinese lantern plants that surround the prison. Later, Arai was amazed at Boruto's luck in getting one of them, who without hesitation ate it. Arai played along with Boruto's ruse as he quickly fell ill and was taken to the hospital wing.