[Crossover] The Sharingan Mage

[Content warning: Itachi fans, beware. He dies in this story, and his death is connected to the protagonist.]

After dying young in both of her previous lives, she wants to live to a ripe old age in her third. Unfortunately, this is the high-risk world of ninja, her body belongs to the Uchiha clan, and her boyfriend is one of the people responsible for the clan's massacre.

Can't run away?

How is she supposed to survive?

She fights tooth and nail to stay alive, and during an experiment in space-time travel, she meets a little green-haired brat who likes to hold a sword in his mouth. There are Devil Fruits over there. If she can get her hands on a Logia type, she'll be immune to physical attacks.

She plans to drop by and see the green-haired brat, and find a Devil Fruit, but she never expects to wind up in another high-risk world, where demons eat people at night. And to top it off, she's incredibly lucky: she runs into a demon with six eyes.

Wait, what?

She's a mage. Isn't a close-range fighter the perfect matchup for her?

Premise: If you can't run away, roll up your sleeves and give it everything you've got!