It's your standard romance ecchi series, but I like the swimming pool setting and the main characters. It flows quite well and I find myself rooting for the male character's final victory, which I find is a great indicator of the quality to the story.

The fanservice isn't too conflicting with the story and character progression. Rather, I like that the fanservice and ecchi is used to advance the story. This is usually what I look for in the ecchi genre, because life is full of ecchi, without being smut.

I like series like this one that can be mature (or rather appropriately immature) over those that capitalize and focus on the panty-shots or whatever.