Tokyo Metropolitan Foundation for History and Culture is an organization dedicated to promoting arts and culture through the operation of metropolitan cultural facilities, such as art and science museums, theatres, and halls, and through various Arts Council Tokyo programs. This article series focuses on people working in the foundation to introduce their jobs and personalities. The first edition features three experts in theatre technology at the Tokyo Metropolitan Theatre: Koichi Ishimaru, who is in charge of sound; Keisuke Niijima, lighting and image projection; and Chihiro Matsushima, stage management. We spoke with them about their work, careers, and things they value in their roles.