13th Year of an Obsessive Marriage

The daughter to a family that owns a development company, Ruka Kosaka, is reunited with her childhood friend, Mikage Mizuki, after 13 years... for an arranged marriage. The two know they are getting into a loveless marriage, but if just something can help start their relationship off on the right foot... or so Ruka thought, but Mizuki seems to be distant and uninterested in anything. Looks like it's not worth getting hopes up. However, the first chance Ruka gets to look deeply into Mizuki's eyes, it seems like there's far more feeling, passion even, than what she's been led to believe.