The city hall of a county seat or prefectural seat is essentially a castle surrounded by an inner loop road, and accessible through twelve gates, each assigned a member of the Chinese zodiac: 子門 (rat), 丑門 (ox), 寅門 (tiger), 卯門 (hare), 辰門 (dragon), 巳門 (snake), 午門 (horse), 未門 (ram), 申門 (monkey), 酉門 (rooster), 戌門 (dog), 亥門 (boar). The dragon gate (辰門) is the east south-east gate.
This configuration is not unique to Asia. From a history of Norwich
, England, in the 13th century (here the gates are named after Christian saints):
Walls, mainly of flint, were built on the bank encircling the town. Twelve gates gave access to the town (and also facilitated the collection of tolls). They were King Street, Ber Street, Brazed Gate, St. Stephen's, St. Giles, St. Benedict's, the small postern Heigham Gate, and on the north side of the river, St. Martins, St Augustine's, Magdalen Gate and Pockthorpe Gate. Bishop's Gate controlled the river crossing.
More about how closely the characteristics of the kirin in Ono Fuyumi's novels track the original Chinese mythology can be found in this Wikipedia entry
明郭 [めいかく] Meikaku, capital of Wa Province