The simple and straightforward system is reflected in the design. This product is suitable for long-term use as it can be re-assembled, maintained, up sized, and down sized by users, so that they can utilize this structure to respond to upcoming changes in their lifestyles such as a change in the number of family members or makeover of rooms. When users want to dispose of the sofa, they can sort and discard the materials by themselves. The materials are also selected with consideration for the environment. The modular composition is easy-to-use in any space, from commercial space to housing space. The casual materials, simple styling, and good color variation are useful for many purposes, and each element is suggestive of users relaxing on the sofa. The theme "a sofa that is gentle to users and society" also sounds lovely.