Long ago, the cherubim Lucifer turned his back to God and waged war with His angels...
...but in the end, he was slain and his army scattered to the winds.
Six thousand years later, Lucifer has been reincarnated in the body of a young child... and it's only a matter of time before those memories of the past war awaken and the world is once again thrown into chaos.
Anticipating this, a single angel volunteered to be sent down to prevent the resurrection before Lucifer's minions find their leader...
...thing is, Lucifer reincarnated as a sweet, ditzy little girl, who wouldn't hurt a fly.

Torte, a little witch girl, comes to Earth to complete her training and find her master, and for that she picks an employee of Famitsu (the famous video game magazine this manga was originally serialized in). Thus begins the witch's life at Famitsu.

Foreign exchange student Alyosha Stalina has been attending a Japanese high school for 3 months. She comes from the nation of Solessia but she is yet to fit in with the other students because of her unfriendly demeanor and cold personality. Rightfully so because Alyosha is a trained assassin that has been murdering people since she was 5 years old. Officials in Estolakia, a country devastated by the attacks from Solessia, found the orphaned Alyosha and trained her as a top notch assassin to work against Solessia.

Her most recent and soon to be last mission is to murder the president of Solessia who is to attend the high school she has infiltrated for 3 months. However, the mission is aborted and she is ordered to remain a student. The only thing Alyosha knows how to do is to be an assassin and has never learned how to be a normal teenage girl. Will Alyosha be able to complete her most difficult mission yet?