You Gave Me A Reason.

Ai is a happy-go-lucky energetic small girl with bright red spiky hair. Zara is nearly the complete opposite. She is a dark skinned tall girl with brown hair and eyes, except for a lavender streak in her hair.
They are both roommates and have waxing homosexual feelings for each other. Zara suffers from an alcohol addiction and major depression. Ai just wants her to be happy.