「 Yui_Tatami Chair 」 extends traditional tatami from a flat surface into a three-dimensional curved backrest, creating a new sensory seating experience through the fragrance of igusa rush grass, the tactile warmth of wood, and ergonomic design. The low backrest encourages a natural sitting posture, balancing relaxation and focus, while allowing users to reconnect with the warmth, aroma, and intrinsic value of natural materials.