A middle school student named Hikaru Amatsuga discovers a mechanical lifeform...
Mecha-Ude: Mechanical Arms
Season 1 Episode 5: Are You Hiding Something?
Aki discovers the Mecha-Ude user responsible for her family's death, only to find it's her long-lost twin sister Fubuki, who was also supposed to have perished in the tragedy. Their reunion uncovers a shocking truth about the incident, and Aki learns of another devastating revelation.