Mar 4, 2020-present
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Mamehara Issei (豆原 一成; born May 30, 2002) is a Japanese dancer, rapper, and dancer. He is the youngest member of the Jpop group JO1 formed through the survival show Produce 101 Japan. Mamehara Issei made his debut with JO1 on March 4, 2020 at the age of 17.