Enchanter Vol. 9 (manga)

Poor tortured Mercurio! The dueling personalities at war inside her body are ripping her sanity to shreds. Haruhiko will have to fight harder than ever to protect her, but an unknown history hides its own secrets...and Mercurio's problems may be too big to battle alone. The hardest lessons of Haruhiko's young life await him. And if saying sorry is difficult, imagine having to say goodbye...forever.