The supporting characters' relationships are better than mains and in general are just better characters overall. The mains were just way too plain/vanilla and they quickly became boring to watch without supporting characters. That really sums up how much you can expect out of this show and how good it will be. It's hard to have a good story without decent main characters, but the supporting characters are decent at least.
I also have no idea why this has the ecchi tag, maybe one scene is deserving of that tag. The majority of the rest are not even close, more wholesome than anything.
6/10 - Mostly for the supporting characters.