The Retired Hero is an Extra - Chapter 196 - : Mana Theory 101

Xiao Rou, a girl growing up in a poor countryside family, finds that she’s actually the daughter of a wealthy couple. Her mother had mistaken another girl for her back at the hospital. Thinking she would change from an ugly duckling to a noble swan and live happily ever after with her real family, reality strikes her in the face.

The other girl, Xiao Jinning, who had taken her family, her fiancé and everything else from her, uses every mean possible to frame her up, so when she returns to her biological parents, she finds her parents despising her while still doting on Xiao Jinning. Framed as a thief, she is expelled from the family and as soon as she walks out the door, she gets hit by a car and her spirit dies a miserable death thanks to Xiao Jinning.

Meanwhile, Tang Xi, a real princess, the heiress of the powerful Empire Group, is murdered by her greedy relatives. When she opens her eyes again, she finds herself in another girl’s body. She has become Xiao Rou and has a magic system—008 in her body! With the help of 008, she begins her journey for revenge. She would avenge poor Xiao Rou, punish her murderers, become the most famous star, and… make up with her true love—Qiao Liang.

- Description from Novelupdates

The Empress who dies in torture, An Rushuang is her name. After she wakes up, she finds herself has time-travelled to when she was twelve years old, but she would turn into Major General’s white horse at night. He is a general who orders about the winds and clouds on the battlefield, and she is a little girl lives in her boudoir seclusively.
She endeavors to change her fate, and he spared no effort to win every battle. They meet each other every day, well, it’s night to be accurate. Is that a dream or not? She pleads to marry the seignior to win peace for her family, only to find he is the one she is going to marry.
“Growing old with you under the same roof is my long-cherished wish”, thought them both.

- Description from Novelupdates

Orlax Tirshtain is the villain in the global game [Unification of Empires]. The tyrannical, cold-blooded emperor is a man who slaughtered his own family with his own hands and ascended the throne with their blood—a power-obsessed madman. Despite five years having passed since the game’s release, no one has been able to defeat this lunatic. So, how the hell did I become this damned?????

The story revolves around Charles Karino, a Levaamu Empire mercenary aerial pilot who mans the twin seater reconnaissance seaplane Santa Cruz. One day, he receives a preposterous assignment: to fly solo over 12,000 kilometers of enemy waters to protect a girl named Fana del Moral. Fana happens to be the next in line to the empire’s throne and a girl possessing beauty “equal to 5,000 beams of light.”

This is a standalone book. There’s another series under the name “To Aru Hikuushi e no Koiuta” (Love Song for a Certain Pilot) set in the same world, but in a completely different place and with different characters.

– Ulrezaj @ Mazui

Adapted to anime as “The Princess and the Pilot”