Seinendan is a theater company formed by Oriza Hirata in Tokyo in 1983. We have been pursuing a new theatrical style through the practice of Hirata's "contemporary colloquial theater theory." This totally new style has had a strong influence on Japanese theater since the 1990s as well as on vast areas such as literature, linguistic study and language education. We are quite active worldwide, almost annually touring abroad. Especially in France, where Hirata's pieces are more appreciated. We also eagerly collaborate internationally through joint projects with artists in France, Korea, Australia, the U.S.A., Ireland, Canada, and more. We are now running two theatres; Komaba Agora Theater in Tokyo, our home base since 1983, and Ebara Riverside Theatre in Toyooka City, Hyogo, our new home base opened in 2020 and presenting regularly theater productions.