Hitomi Landsknecht commands the Guardswomen, a paramilitary force safeguarding humanity’s dwindling remnants in a male-vanished dystopia. Clad in militaristic black and a flowing cloak, her gray hair frames a face marked by exhaustion, her stoic resolve matched by the weight of her hybrid swordblade and cannon. As factions clash, she contends with the nihilistic Kisaragi dynasty, whose leaders embrace extinction over survival.

Three sleepless years haunt her, tormented by fractured visions of Hitomi Aida—a young 1986 truck crash survivor whose consciousness bleeds across timelines. This psychic entanglement fuels her weariness, yet sharpens her resolve. Amidst the chaos, Yuki, a Kisaragi adoptee, relentlessly bridges their divided worlds, defying her adoptive sister Satsuki’s violent interventions.

When Project ICE emerges—a contested "salvation" tech touted to restore reproduction—Hitomi exposes its lethal reality: a terraforming weapon. Battling ICE’s architect Julia and Lady Kisaragi, she triggers a chain of defiance that culminates in her sacrificial death. Yuki, in grief, activates ICE, unwittingly forging a temporal loop. Centuries earlier, Hitomi Aida awakens in a hospital, inexplicably pregnant, clutching a snowflake pendant echoing Yuki’s. The cycle closes, binding both Hitomis across eras—soldier and survivor, linked by blood, loss, and the relentless turn of time.