HA KO is under the umbrella brand, Kaorujudo. At Kaorujudo they believe in the management philosophy of "Kyakuai-kun" and devote themselves to developing and manufacturing better products under the management philosophy of "precious customers and love fragrance." To protect nature, they use palm shell charcoal, which is designated as an eco-friendly raw material, as a raw material for incense sticks with little smoke. In addition, to focusing on a material that replaces the soybean flour, which is the main raw material for incense sticks, and succeeded in developing an "eco incense stick" made from unused domestic wood, and a part of the sales was made by the "Setouchi Olive Fund". By donating they are cooperating and supporting nature conservation.