Dantalian no Shoka
ダンタリアンの書架 (original)
Starring Miyuki Sawashiro, Daisuke Ono, Kana Hanazawa, Masayuki Katou, Ami Koshimizu, Gou Shinomiya, Sayuri Yahagi, Mamiko Noto, Takahiro Sakurai
It's a animation and action & adventure show, and has a rating of 6.6 out of 10 from Imdb which is usually fine for this kind of show.
Watch it here
Not found streaming from Argentina.