The Mischievous Twins
おちゃめなふたご クレア学院物語 (original)
Starring Noriko Hidaka, Tesshou Genda, Sumi Shimamoto, Aiko Sato, Keiko Han, Emi Shinohara, Tomiko Suzuki, Kae Araki, Yuuko Kobayashi, Eiko Masuyama
It's a animation and action & adventure show, and has a rating of 7.9 out of 10 from Imdb which is usually fine for this kind of show.
Watch it here
Not found streaming from United States.