The theme is Uesugi Kenshin, a legendary Sengoku warlord, and was inspired by his nickname, ``Echigo Dragon.''
It is paired with Takeda Shingen, the ``Tiger of Kai,'' and this work has a bronze-like expression.
This color could only be achieved by using rocks from Amakusa, Kyushu, which Koga uses as a material for his porcelain.

One of Koga's most popular works is Hooyoroi Hai.
It uses the unusual helmets of Sengoku warlords as a motif to express people's way of life and spirit.

Tea ceremony is a Japanese comprehensive art that developed as a form of education for the samurai class. Sake vessels developed as kaiseki vessels based on this lineage.
Koga describes this work as ``a porcelain cup in the form of a cheek armor, which was naturally derived from the close connection between tea ceremony, Sengoku period military commanders, and crafts, especially pottery.''

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