★Mr Ackerman the French teacher★(not aot)

Ymir aka the most famous superheroine of them all Mushroom girl.But would you believe me if I told you that her newest mission was her being assigned to going undercover in Maria high the most expensive high school in the whole country where she'll have to use her talent/hobbie of gardening to lie about how that's how she got allowed in as the knew student (even though she's 18).She takes being 14 and when she slowly uncoveres the reality on their new French teacher what will happen?will the mission fail?will it end in a battle or will he surrender? make sure to read this book to find out!