Karada wa Kodomo, Nakami wa Ossan no Nariagari Boukenki: Satella mo Tsuiteikimasu!

When Satella was young, her parents were killed by monsters. One day while hoping that her peaceful daily life would continue, she met Gray Millard, the third son of a noble family. She was touched by Gray's determination to carve out a future for himself using advanced magic and special skills, despite the harsh punishment his stepmother meted out to him. She decides to go on an adventure with Gray, who had his sights set on the world. (Source: Kadokawa, translated)