Tensei Kizoku no Isekai Boukenroku ~Jichou wo Shiranai Kamigami no Shito~

Shiina Kazuya, the protagonist of the story was killed by a stranger in front of a convenience store when he tried to protect two young girls escaping from the stranger who is trying to stab them. The girls fall and are too overcome with fear to get up and continue running away. When Shiina Kazuya awakens he realizes that he was reincarnated as the young noble Cain von Silford, the third son of an aristocrat (Margrave Garm Von Silford) and his second wife (Sarah) in a world filled with sword and sorcery.