Wakkanai, Hokkaido. The flag as a whole represents water, and the three letters W stand for “will”, “wisdom” and “work”. The inside is a steering wheel of a ship.
Wakayama, Wakayama. The circle is a stylized katakana and the inside is the kanji, representing mountains surrounding the city.
Sapporo, Hokkaido. The white hexagon represents snow. The circle inside is the the first kanji of Sapporo. It also represents a katakana. The star is Polaris, as well as the katakana.
Okayama, Okayama. The symbol in this flag represents mountains.
Matsumoto, Nagano. The circle represents a pine, and the inside is a stylized kanji.
Kaizuka, Osaka. The five prongs represent five pine leaves that surround the waves of Osaka Bay and the kanji.
Hakodate, Hokkaido. The inside of this five-pointed star is the single tomoe which represents the map of the peninsula.
Fukushima, Fukushima. The nine katakana on the outside of the symbol and the four katakana in the inside make the rebus of Fukushima. 
Issey Miyake
Ron Terada
