Born in Shiga, 1970.
Affliated with Atelier Yamanami since 1989.
There are times when Mitsui forgets to eat for an entire day, devoting himself entirely to construction paper and crayons and producing 2 or 3 works. Other times he may spend the week gazing far away at the sky. Mitsui has produced more than 2000 works since 1989.