Could you give me some harem animes that have a nice story and is ecchi... thank you in advance..

Highschool DxD is a great one if you're not shy when it comes to ecchi. The story is pretty generic up until around episodes 6-7 I believe. After that it gets pretty interesting, hoping for a season 2.

Highschool DxD is a great one if you're not shy when it comes to ecchi. The story is pretty generic up until around episodes 6-7 I believe. After that it gets pretty interesting, hoping for a season 2.

i already finished watching it, and it is quite good.. and im looking for more harem anime

Hmmm I personally enjoyed Infinite Stratos, so you could try that. It's a typical generic harem in a mecha/school setting.
Maken-Ki is another ecchi harem if you don't mind a pretty silly plotline.
I think this is all the harems I've seen so far that I've remembered.

too many to count...
from the top of my head

rosaio + vampire
sekirei
sora no otoshimono
princess lover
asobi ni ikuyo
dearS
girls bravo
mayoi neko overrun

Hmm... Yeah, there's a lot.
Aquarion
Kampfer
Rosario to Vampire
Sora no Otoshimono
Ikkitousen
Ichigo Mashimaro
Queen's Blade (Very ecchi)
Freezing
Sekirei
MM!!
High School of the DEAD
Zero no Tsukaima

thanks a lot guys, ................

Watch:
Kore wa Zombie Desu ka
Kanokon
Mayo Chiki!
Omamori Himari
To LOVE-Ru

Maybe?:
Bakemonogatari + Nisemonogatari
Hyakka Ryouran: Samurai Girls
Nyan Koi!
Nogizaka Haruka no Himitsu
Shuffle!