My honest opinion on this story is simple - I came for the ecchi and finished because of ecchi, I didn't care about the plot, I nedeed good, strong story like To Love ru and it delivered.
The colored version of the story is really great for people who likes drawing of girls with big boobs, every single chapter filled with delight, the art is truly enough to make you invested.
However the story is very typical - Basically To Love Ru, but in hot springs. There are not a good main girl like Momo, so no harem ending, the problem is from the very beginning the story tells you right away who will be the winner, so I didn't see any point to explore other characters story, since what is the point, when only one girl will win?
The biggest flaw of the ecchi is an absurd amount of text, I don't see any reason why I have to see this amount of bubbles every single page, it wasn't nedeed at all, since most of it is filler. If you don't like seeing a big amount of text, this manga is not for you. Honestly this is a reason why I will not read it again for a very long time, since to get to girls you need to read quite a lot of fillers.
The last arc (around 2-3 last volumes) is extremely convoluted, I don't know why the author wanted to make a simple story that complicated for the sake of explaining to us why other girls are not gonna get their ending, otherwise someone will die, it is bullshit.
Thinking about it, I didn't really told you about any characters, even the MC. All I can say, that he is too perfect, basically kinda Shiro Emia, a self-insterted protagonist as always, it is very sad to see that due to publication in shounen jump, everything just stops at him falling on girls and their body parts. Any man in his position will literally do a bit more or at least take the situation into his control, even Yuuki Rito from To Love Ru had moments where he had to do lewd stuff by his own will, not here. Mc is only receving. His "savings" of girls are not what I mean here, the situations where he could make a step to make more intimate relashinships with girls will not happen.
And yet I think this is a good ecchi story, unlike To Love Ru darkness with it school girls who are just kids basically, here we have more developed girls. 8/10 (Read only for ecchi)