Toshiki Okada is a playwright, novelist, and the director of the theater company chelfitsch. In 2005, he received the 49th Kishida Kunio Drama Award for “Five Days in March.” In 2007, he participated in the Kunstenfestivaldesarts with his work “Five Days in March.” Since this debut of his work overseas, he has continued to present works not only domestically but also internationally, putting on performances in over 90 cities across Asia, Europe, North America, and South America. Since 2016, he has also consistently created and directed works in a repertory program at a renowned public theater in Germany. In 2020, his work “The Vacuum Cleaner” (Münchner Kammerspiele) and in 2022, “Doughnuts” (Thalia Theater, Hamburg) were selected as part of the Berliner Theatertreffen’s “10 Remarkable Productions.” As a novelist, he published “The End of the Moment We Had” (Shinchōsha) in 2007, “Broccoli Revolution” (Shinchōsha) in 2022. He was appointed as the Artistic Director of the Performing Arts Festival: Autumn Meteorite Tokyo in 2025 and the Artistic Director of Performing Arts at the Tokyo Metropolitan Theatre in 2026.

Conductor Kazuki Yamada is the Artistic Director of Music at the Tokyo Metropolitan Theatre, having assumed the post for the 2026 fiscal year.
He first achieved international attention upon receiving first prize in the 51 st International Besançon Competition for Young Conductors in 2009, followed closely by his European debut with the BBC Symphony Orchestra. His illustrious international career includes serving as Principal Guest Conductor of the Orchestre de la Suisse Romande (2012–2018) and Artistic and Music Director of the Orchestre Philharmonique de Monte-Carlo (2016–2026). In April 2023, he was appointed to Chief Conductor and Artistic Advisor of the City of Birmingham Symphony Orchestra, ascending to its Music Director in May 2024. Beginning with the 2026/27 season, he will also assume the position of Chief Conductor and Artistic Director of the Deutsches Symphonie-Orchester Berlin.
In Japan, alongside regular guest appearances with major orchestras, Yamada serves as Music Director of the Yokohama Sinfonietta and Music Director and Chairman of the Philharmonic Chorus of Tokyo.