Ginrô kaiki fairu (1996)

Kosuke is a young student at a high school who gets involved in an accident with his best friend. He survives the motorcycle accident, but his friend dies. Waking up reveals though that Kosuke has changed...now one other personality beside Kosuke demands to exist. This other personality seems ready to take over in situations of extreme stress. The sensitive and gentle Kosuke is opposed by his counterpart highly intellectual yet naughty Ginrou. This "transformation" also comes along with an actual change in Kosuke's appearance, since Ginrou has curly hair and blue eyes.