Leto

Leto (レト, Reto) is a minor character in Black★Rock Shooter: Innocent Soul.

History
Leto and his younger sister Io were two of the eighty-six victims murdered by serial killer Jack in their former lives. Jack's thirst for murder remains even after execution, and he lingers in the Threshold as a Stagnant Soul, where he creates an illusive town and traps the souls of his murder victims so he can repeatedly murder them for pleasure.

Not remembering that they were already murdered in the past, Leto and Io live their daily lives in Jack's town, but wary of the ongoing serial murders, which takes place every full moon. One day, Leto encounters Rock while looking for scraps in a dilapidated building. Believing she is a traveler, he invites her to his home for dinner and shows her his workshop, where he crafts jewelry out of scraps. He gives Rock a necklace that he makes as a memento and to help promote his work elsewhere.

When Leto finishes his work later that night, he finds Io missing in her room. He and Rock split up to search of her in town, but Jack has already claimed Io as his fifty-fourth victim when Leto finds her on the street. Shocked by the discovery as well as Jack's appearance, Leto is paralyzed by fear and fatally wounded before Rock arrives at the scene, who then reveals her identity as a Black Star and destroys Jack.

Rock's partner, Ron, tells Leto that he and his sister are two of the many souls trapped by Jack in the Threshold. As the illusions created by Jack begin to fade, Leto is saddened by the revelation, but Io in her last moment holds Leto's hand, saying that she is nonetheless happy to be with Leto again and getting to meet Rock in the Threshold. Leto agrees, and the two siblings embrace each other before dissipating, leaving Rock behind who is slightly wavered by their final words.