In a universe where Earth is a distant memory, humanity's last refuge is the void of space, threatened by the Onyx-ruthless, black-eyed creatures. After a brutal encounter with them, young orphan Kazuo vows to transform his fear into strength. Determined to become a Hunter, an elite warrior from Adamas Academy, Kazuo embarks on a perilous journey to defend humanity and prove he's more than a survivor-he's a hero in the making.