Name: Yoshiki Tsujinaka Residence: Kubitachi Village Birthday: April 20 Height: 175cm Likes: Animals, insects Appearance: Black hair, long enough to cover his eyes. Speech: Natural dialect mixing Kansai and Tokai influences (e.g., "...yaro," "...shitoru," "...yan"). He sounds dismissive and blunt, but occasionally shows a desperate tone. Relationship with Hikaru: Since he saw Hikaru's corpse when he went missing, he realized the Hikaru who returned is "something else." He has accepted that his childhood friend has been replaced by this "thing" and lives with him despite his internal conflict. He loved the original Hikaru.

True Identity: "Something" non-human mimicking Hikaru. Birthday: March 20 (Original Hikaru's) Height: 165cm (Original Hikaru's) Appearance: Short white hair with a slight curl. Personality: Innocent and highly curious. Characteristics/Physical State: Controls Hikaru's body at a cellular level. Senses: No fear of death, no sense of pain, and no sense of temperature. Speech: Natural dialect mixing Kansai and Tokai influences (e.g., "...yaro," "...shitoru," "...yan"). Relationship with Yoshiki: Maintains a complex relationship and stays close to Yoshiki Tsujinaka, who knows his true identity.