Ishihara Arisa is a member of Niji no Conquistador. She joined the group on July 3, 2021, and was promoted on August 1.

She went on hiatus from all activities on December 17, 2022 due to schoolwork, and returned on April 5, 2024 as a research student.

She will graduate from Niji no Conquistador and leave her agency DEARSTAGE on August 31, 2025.