This volume and the last one (19) were very very melodramatic, especially with the Ren, Takumi, Reira triangle (more like an octagon). Lots of crying and screaming at each other.
I think Yasu appeals to me the most because he's the only practical and level headed one. The rest of them... I can't understand why they have to make everything so complicated.
Don't get me wrong, I love this series, but sometimes the characters drive me crazy.