Red Fang: Blue Sonnet(1989)

Red Fang: Blue Sonnet is a sci-fi anime series following Sonnet, a cyborg warrior engineered to be humanity's ultimate weapon. Dispatched to Japan to monitor Lan, a quiet girl suspected of being possessed by the rage-fueled esper Crimson Fang, Sonnet's mission becomes complicated when contact with her triggers Lan's latent powers. As the two clash, an unexpected bond forms. Sonnet begins reconnecting with her suppressed humanity while Lan struggles to maintain control over the dangerous entity awakening within her. The series explores themes of identity and redemption through their escalating conflict, blending action with character-driven drama as both characters fight to define who they truly are.