That's a hard one, since it's been a long time since I watched one... But I think it would be the fifth season. To that one others were okay, but I actually didn't like that season well back then. That's the one that I least watched, only few episodes.
IchigoKurusaki
Otakuite+ | Posted 10/14/11 | Reply
I think the new season is kinda close but I have to agree on season 5.
LightFykki
Drachen Herz (Otaku Eternal) | Posted 05/14/11 | Reply
That's a hard one, since it's been a long time since I watched one... But I think it would be the fifth season. To that one others were okay, but I actually didn't like that season well back then. That's the one that I least watched, only few episodes.