One of Koga's most popular pieces, Hooyoroi Hai, uses the motif of the unusual helmets of warlords from the Sengoku period to express the way of life and spirit of people.

``Today's era is like an era of subjugation,'' says Koga.
With the development of social networking sites and the ability for everyone to have a say, we have entered an era in which people can aim higher than their origins or the area in which they were born and raised, as long as they have the will and courage to speak out. Within this worldview, Cheekyori Sakazuki is a work that uses the unusual helmets of Sengoku warlords as motifs to express people's way of life and spirit. It is also a shout out to the aspiring military commanders living in today's world.

This work was inspired by the speedy and brave image of a hawk, or the armor of a crow tengu.
The fur on its cheeks is waving toward the sky, and its mouth is wide open as it cries to intimidate its opponents.

The colors of white, purple, and indigo represent Mt. Fuji with snow on its peak.
The white color is the base color of the porcelain, and the parts from blue to purple are made with a cobalt-based glaze that changes color by applying a transparent glaze. Therefore, you can enjoy two textures and color gradations: purple is matte and indigo is glassy.