As the host country of the 2025 Japan International Exposition (Osaka-Kansai Expo), which will be held under the theme of "concept design a Future Society Where Life Shines," Japan's pavilion, themed "Between Life and Life," allows visitors to feel the significance of "circulation" through a seamless connection between displays and architecture. The Japan Pavilion, which embodies the relay of life with its circular structure, has a unique presence as the host country's pavilion. In addition to a flow of movement that naturally draws visitors into the Japan Pavilion as they walk around its perimeter, its most distinctive feature is the countless "wooden planks" arranged in a circle. Through the gaps between them, visitors can catch a glimpse of the interior, and the continuity between inside and outside, displays and architecture, gives visitors an opportunity to become aware of the "in-between" space that is also the theme of the Japan Pavilion. Another feature of this pavilion is the concept of "Japan Pavilion that eats garbage." Garbage generated at the Expo site will be decomposed by the action of microorganisms and converted into energy and water. This "living pavilion" allows visitors to relive the process through an installation*, experiencing firsthand how the generated energy and water power the Japan Pavilion. As they tour the pavilion, which is composed of three zones, they can feel the significance of "circulation," a core aspect of Japanese aesthetics, and realize that they themselves are part of this long and grand narrative. In addition, by using "wooden panels" mainly made of CLT (cross-laminated timber) and steel for the structure, CLT is used in the simplest and most symbolic way possible. The CLT used in the Japan Pavilion is planned to be reused by companies and local governments throughout Japan after the Expo, and has been designed to be easily dismantled and repurposed. By understanding the value of "circulation," which underlies the Japan Pavilion's theme, "Between Life and Life," we aim to encourage visitors to re-examine the circulation that is so close to us, leading to an exploration of the future of society and hints for a sustainable future. Our company is responsible for displays concept design (schematic design, working drawings), construction, and operation of this Japan Pavilion. *A contemporary art form in which the entire displays space is experienced as a work of art. The audience walks around the space, enjoying the artwork through sight, sound, and other senses.