Their moms are friends already? I absolutely love that little detail. It's gonna help make a potential relationship a breeze if their families already get along well.
I'm surprised Yuu accepted playing third wheel so easily. I thought she'd be considerate given how she's been teasing Umi over her soon-to-be relationship with Maki.
So not only do they have Yuu as a third wheel, even Nina is possibly tagging along even though she's got a boyfriend she could be going on a date with instead? I suppose this is a situation where having decent male friends who could be playing wingman taking care of the other girls would have been handy, but I don't count any for Maki. Baseball guy doesn't count yet to me.