IKIMONO - a bacteria-based air purifier which is nonelectric. The design concept corresponds to a speculated future air has been polluted future based on current situation. The application of biotechnology and biomaterials has been popularized. The design would bring user into the context of speculated future by present daily necessities from the future physically by using bacterium-based air purifier. By applying the methodology from speculative design, it aims to critical the current situation and guide people to reflect on it. Further, proposing a practical solution by new way of product making with real function by using bacterial cellulose. Explore the possibility in product application by using the original characteristics of different bacteria. Ultimately, developing a new eco-friendly material that could make in product without industrial manufacturing.