KAI is built in the preserved district of traditional structures in the Utatsu-sanroku district. Its exterior has been renovated using cedar wood and clincher-built according to the preservation regulations. On the interior, we strove to create a world view that reflects KAI through experimenting with new-old fusion in pillars, walls, etc. and keeping additions to a minimum.

Looking from the street, one can see two adjoining square-shaped rooms at the front and rear. The room at the front has Sakan plaster-finished walls (clay + straw + sand), while the ceiling has the shingles underneath the tiles in open view. The room to the rear contains a small tea ceremony room (four and a half tatami mats) and has an open ceiling 6.55 meters high. As a result of assembling the iron frame on the inner side of the wood structure, a feature is that the room has no structural members such as beams and angle braces, which usually appear on the surface. The walls are covered with Shikkui plaster. The floor in both rooms is laid with “keystones” from Ise.