When a masked man stabs her best friend, Tsukiko Himura vows to find out who's responsible. Her search uncovers a brewing conflict between two rival gangs. The safety of her beloved city hangs in the balance.

Following in her sister's footsteps, she dons the jacket of a Knight Himura. Tsukiko takes to the streets, fighting for a new purpose. As a vigilante-turned-hero, she must do whatever it takes to protect the people of Tokyo from all-out war.

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