It is a shame to see no review for this manga so I decided I'll try to convey my feelings so you don't simply decide to not read it due to its tags.
Is it ecchi? a bit, but not to love ru. mostly for comedy such as - you are the coach so you can't see us as women.
No, you do not need to like sports or understand pro wrestling. heck, I dislike almost all sport anime cause I'm jealous that I can't do such things ( so I did 10 pushups while reading this manga). the selling point is the character relations and the events.
basically pro wrestling is like battling in normal manga. fighting with hammers and out of ring takes place too ( heel vs something? you'll learn:P )
story. it actually has a really touching story. the protagonist loses his memory and works at el palacio (Spanish?) as a manservant . he does NOT have a harem, does NOT randomly pull clothes down and such retarded yuuki rito actions ( the idiot lead from to love ru )
the art isn't stellar but is acceptable. basically like the cover
characters- a great variety. their interactions are the main point of the story ( looking forward to their pasts , interactions, why are they at el palacio? etc. )
Enjoyment
I liked it, I read it in one sitting and felt good about it.
overall
definitely worth a test try. one may call this a hidden jewel. if I had to make an analogy it would be a rusty car that runs well. you'd think it'd break down but it doesn't
Thanks for reading . I hope you try (and enjoy it) Disfrutar!