So remember the good ol’ tale of the 3 Musketeers? Otomate came up with a BRILLIANT idea using the concept “what if D’Artagnan was a WOMAN and instead of being bffs with the 3 musketeers she got to hit dat sheit?” And so Musketeer was born! Our story starts when our heroine named D’Artagnan, (which I’m seriously shortening to Darty cause I’m not about to type that name out over & over in this post) is sent out to town to do some errands by her father. When she returns, some evil Gargoyle demon is attacking her father but being fragile & womanly all she can do is watch in horror as her father gets killed. Suddenly a hot dude shows up telling her that he was her father’s former pupil at the Chevalier school. He tells her that if she goes there she’ll find out the reason why her father was killed and will be able to train to get stronger! D’Artagnan decides it’s a good idea and decides to enroll there. She trains with the teachers on sword fighting and while there runs into the 3 most popular mans at the school: the 3 Musketeers. However, there’s a rule that if someone challenges you to a duel and you accept, the loser must swear loyalty to the opponent.
Our heroine Isora Kanna attends class with her 2 friends Kazuto & Yuuki and after school suddenly their school gets bombed. They run into the school building when some dude comes and tells Kanna that she must come with him and then she passes out. When she wakes up she finds herself in some military base and some ossan named Maximillian tells her that she’s in some other country now because THE WORLD’S AT WAR with suicide bombers running left & right. The totalitarian army is fighting the freedom army and Sujiku, Kanna’s home town is somehow caught in between. On top of this, Kanna’s parents hid the on-switch for a weapon of mass destruction in Kanna’s genes! She’s now their ultimate weapon girl whether she likes it or not, but at least she has hot army dudes protecting her.