In the neon-drenched capital of Yamato, where lights are overshadowed by darkness, a covert armed force known as “Kaika” is deployed to handle major incidents within the city. When facing criminal organizations or terrorists that the police fall short to handle, especially those threatening national facilities or plotting to assassinate key figures and royalty, Kaika is tasked with executing armed clean-up operations.

Ujaku and the Eihei both belong to Kaika, serving as the silent guardians of the regime. They are symbols of fortune, bringing safety to the nation and its people, yet they also herald death and destruction, mercilessly sweeping through the darkness. Like crows gathering in one place, the more of them there are, the more bodies are left behind…

在大和霓虹璀璨的宮城首都，光芒無法穿透的陰暗之處，部署著一支負責首都範圍重大事件處理的外勤武裝部隊——靈火（Kaika）。遇到類似警方無法處理的犯罪組織或恐怖分子，進行可能危害國家重要設施、暗殺政要皇族等潛在威脅時，靈火部隊將受命暗中進行武裝清理。

烏鵲與影兵同樣隸屬於靈火部隊，作為政權的沉默守衛者，他們應是幸運的象徵，為國家和民眾帶來安全；同樣預示著死亡與毀滅，毫不留情地掃蕩黑暗。如同烏鴉聚集的地方一般，聚集得越多，證明屍體越多……

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