Nagisa first appears working in the Marine House seafood restaurant as a waitress, catching Ryuji's attention with her t-back bikini. However, although she seems sweet and innocent, she actually suffers from Dissociative Identity Disorder, and has an evil side who calls herself Yasha.
She is a member of the Midnight Angels gang under Junya Akutsu, and is his girlfriend. Her mental disorder arose after he raped her in the past. Ryuji saves her life, and she eventually overcomes her problems and becomes his girlfriend. They are still together in GTO.
(Wikipedia)
In the Shonan Junai Gumi OVA (episode 4), Nagisa is seen with long, straight dark hair and goes to the prestigious Fujisawa Girls School. A hanya tattoo appears on Nagisa's back, near her left shoulder, whenever her alternate personality Yasha surfaces and she rides a black Kawazaki Eliminator motorcycle.
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