I'm Done Being a Hero, Even If It's Retirement

Everyone's shocked when 9-year-old prodigy Adelia Ester suddenly refuses to enroll in the elite knights' academy. They don't know that Adelia was magically sent back in time after wasting her life on the battlefield and suffering an early death! Now, Adelia's out to protect her peace from her ex-boss, the evil future emperor, by setting her ally on the throne instead. Will Adelia succeed in one last mission and finally retire for good? Or will she find herself forced to be a hero once more?