I will never understand or sympathize with this mentality. If the ecchi bothers you that much, just stop reading. Go find another series that isn't ecchi. There are thousands of them. Some even with a similar premise. And as far as recommending it, don't. You don't need to tell everyone about every single thing you enjoy. You can just enjoy it on your own.
I love the ecchi and it's a large part of what makes this series unique (yes, I'm aware that a shit ton of other ecchi and ecchi action series exist). Not to mention, given the author, there's no scenario where this series (or anything he wrote) wouldn't be horny and degenerate as fuck.