Ninja Kasumi

Kunoichi Kasumi is a Japanese anime series created by Waku Yaniko.

Plot
Kasumi is a 13-year old orphaned squirrel girl whois a typical teen girl but under this appearence, Kasumi is a decendant from Hatsume no Tsubone (who, in this universe, is an animal) with ninja powers that she uses to protect Tokyo from any danger, specially from dropout, womanizer and Thug Hasajo Mitsunari, but despite this, she's still a teenager who makes mistakes but always learns from them.