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.

Silent and deadly. The Haboku of the Kaika forces possess exceptional close combat skills, combining ancient techniques with advanced technology during combat. Wielding blades that are both mesmerizing and lethal, they slice through enemy armor as easily as cutting silk. They are the blades in the dark, the silent assassins who bring conflicts to an end. Where they tread, only silence remains…

在霓虹閃爍的大和首都大和，燈光被黑暗籠罩，一支被稱為“Kaika”的秘密武裝部隊被部署來處理城市內的重大事件。當面對警方無力對付的犯罪組織或恐怖分子，特別是那些威脅國家設施或密謀暗殺關鍵人物和皇室成員的犯罪組織或恐怖分子時，凱卡的任務是執行武裝清理行動。

沉默而致命。 Kaika 部隊的 Haboku 擁有卓越的近戰技能，在戰鬥中將古老的技術與先進的技術相結合。他們揮舞著既迷人又致命的利刃，像割斷絲綢一樣輕鬆地切開敵人的盔甲。他們是黑暗中的利刃，是結束衝突的沉默刺客。他們所踏之處，只剩下寂靜…

在大和霓虹璀璨的宮城首都，光芒無法熾熱的陰暗處，部署著負責首都範圍重大事件處理的外勤武裝部隊－靈火（Kaika）。進行可能滅絕國家重要設施、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。

無聲而致命。 ，是結束衝突的無聲線索。

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