Theater Cocoon is a theater for various forms of stage expression, including theater, concerts, and contemporary dance. Based on an artistic director system and a season system, artists of the same era inspire and stimulate each other to create a variety of stage expressions. With a total of 747 seats, 24 meters from the stage to the last row of seats on the first floor, and three tiers of side balcony seating on either side of the seats, the theater is very compact for a medium-sized theater. The left and right sides of the seats are three-tiered side balcony seats, creating a very compact space for a medium-sized theater, and creating a sense of unity and realism between the stage and the seats. It also has an excellent stage mechanism and a full range of sound and lighting equipment. In addition, the stage surface and part of the audience seats are movable, allowing for a variety of stage designs that take advantage of free ideas.