Mental illnesses~Mattia Polibio

Yes this is a bit similar to some other story's but...whatever

This is a story where both Mattia and y/n have a mental illness

Y/n's backstory...
Y/n has bipolar disorder which is also called maniac depression,she also had very bad anger issues.
Bipolar: a disorder associated with episodes of mood swings ranging from depressive lows to maniac highs.

When y/n was younger her parents weren't supportive at all and were very abusive to y/n and her step brother.

One day Y/n she had enough of her mother and brutally murdered her...