Angels are genteel and graceful messengers from Heaven, right? Wrong! Sakura Kusakabe will create an invention that inadvertently ruins the future for womankind and thus, angels from the future have arrived to do the only reasonable thing: assassinate him! Fortunately for Sakura, one of them, Dokuro-chan, takes a liking to him but her intentions to protect him prove downright lethal. When Sakura’s not dodging her spiked bat Excalibolg, he’s fighting for his life on river escapades. And when he’s not quick enough, Dokuro-chan’s catchy incantation brings him back to life! Bludgeoning and blood splatters aside, can Dokuro-chan save the one she loves without damaging the future?
In a world where magic is a reality, the young Louise is at the bottom of her class. Dubbed "Zero" by her classmates at Tristein Academy (due to her zero success rate for magic), Louise (along with all first year students) was charged with summoning a familiar; and instead of a cute magical creature, the familiar arrived in the form of... Saito Hiraga, a normal Japanese boy who was abruptly teleported from his own world?! Can both Louise and Saito come to terms with their new and complicated "relationship" and (more importantly) help Saito find a way home?
I believe that if you liked Bokusatsu Tenshi Dokuro-chan you will like Zero no Tsukaima. Eventhough the plot are completly different, the main character share similiarities, Both Sakura and Saito have been forced into the co-existance with the tsundere girl character, and intially don't enjoy it. Also both Dokuro-chan and Louise have a habit of punishing the male character (Bokusatsu more voilently however) but in spite of this eventually a respect is built between the characters. Also both female characters have a habit of freaking out very quickly especially when sexual innuendo is a factor...
Believe if you like one you'll like the other