Slayers Excellent

Lina Inverse and Naga the Serpent, learn how the two rivals first met. In their first adventure, the two rivals meet and run into a vampire during a rescue mission. Next, Lina is hired to be the bodyguard of a rich man's daughter, Sirene. Lina is at first very enthusiastic about it at first, as she is being paid very well, but Sirene keeps spending all of Lina's first half of pay. (animenewsnetwork.com)