Hard times are upon The Kingdom of Forland: the heir apparent Kaito has gone missing and the righteous king was slain by the Evil Chancellor and his Robot Girl assassins. The only remaining royal family member, defenceless and weak-willed princess Alita, flees the castle in the last moment, chased by the Chancellor's Faceless Goons. Yet luck suddenly turns in her favor when she literally falls into the embrace of the most BadassAction Girl in recorded history: bounty hunter Falis. After an accidental near-death experience, the two switch bodies and Falis agrees to assume Alita's persona, take Forland back from the usurper, and protect it until prince Kaito's return. Rounding up her henchmen, she proceeds to the castle to kick ass and earn the title of the most brutal princess in history...Murder Princess is a short-lived 2005 manga by Sekihiko Inui and a six-episode OVA adaptation produced by Bee Train. Although initially believed to be a Red Herring to draw attention from Bee Train's real Next Big Thing for 2007, El Cazador de la Bruja, the OVA proved itself as a very solid piece of work and contained just the right amount of cool action, Romantic Two-Girl Friendship, and fitting (and slightly metallic) musical score to appease long-standing Bee Train fans with its character designs and straightforward story.
After the End: Throughout the story, it is stated that the world is still recovering from a global war that destroyed most of the old civilization; and that civilization was recovering from an apocalypse before that.
Beware the Quiet Ones: During most fights, Yuna tends to fade into the background and leaves most of the asskicking to Ana. However, when push comes to shove, she's more than able to force Falis to go on the defensive.
BFS: The Big Bad's sword is almost as big as he is.
Blood-Splattered Wedding Dress: Though Falis/Alita's white gown isn't technically a wedding dress, it still gets blood splattered enough to fit the bill.
Body Double: The original Milano takes the Princess' place before the invasion in episode one, and dies in the subsequent battle. This causes the body-swapped Princess to take on her name and role in her honor.
For the Evulz: Cecilia's stated reason for killing Falis's whole village.
"Freaky Friday" Flip: One happens between Alita and Falis, which leads to Falis taking the throne in Alita's place and becoming the titular 'Murder Princess'.
Gentle Giant: Pete Armstrong — Maybe "gentle" isn't the word, 'cause he never hesitates to crush a few skulls, but he's got plenty of compassion for his friends.
Gratuitous English: "Murder Princess" sounds a bit strange, though something like "Killer Princess" would've been rather cliché. The theme song is quite good, with the English lyrics making about as much sense as the Japanese.
Karma Houdini: Ana, despite being an adorable Robot Girl, is initially presented as an Ax-Crazy psycho who delights in slaughtering anyone and everyone, from soldiers to defenseless staff. After her creator is killed, she explains that this was the result of her programming and joins the good guys, and eventually dies along with the other Lost Technology when the MacGuffin is destroyed, making this a subversion.
Non-Indicative First Episode: The first episode of the OVA is noticeably darker than the rest of the series, with a few genuinely disturbing moments. For a second, one might wonder if putting Falis on the throne is actually worse than letting the usurpers have it. By the second episode, her character is affirmed to be unambiguously good and the general tone of the show lightens up to resemble most fantasy anime.
Red Baron: Falis-Alita's titular 'Murder Princess' title, which is given to her by her enemies due to both fear and respect of her combat skills. It also doubles as Names to Run Away From Really Fast, especially if you're facing her during battle.
Unstoppable Rage: When things get really bad, Falis sometimes falls into this, and only Alita can stop her. However, this is actually insinuated to be an artifact of Alita's body, since it never happened to Falis before the switch.
What Measure Is a Mook?: Averted once Kaito turns the Forland army against Falis and Alita. The heroes realize that the guards are only serving their country, and go out of their way not to kill them. On the other hand...
A Wizard Did It: How exactly the soul transfer happened is basically Handwaved away. Dominikov gives a brief explanation that doesn't really explain anything, followed by Falis pointing out that his explanation can't necessarily be trusted anyway.