You Are My Regret, Vol. 4: Volume 4

Everything has a cost.When Ai's elder sister, Kozue, shows up and demands that she return to live with their mother, Ai has no choice but to run. She just wants to be free, but as family troubles mount, her world only becomes more suffocating. Unable to ignore her pain, Yuzuru resolves to help Ai make the right decision--one she won't regret. He asks Kaoru for help, but is she willing to put aside her own feelings for the sake of her romantic rival?