Seventh - Manga

Lyle Walt is a young noble boy and heir looking forward to the day he can inherit his familys territory. Except around when he was 10 year old, his parents started neglecting him more and more in favour of his little sister, Ceres. On his fifteenth birthday, he is challenged to a duel by his sister to see who will inherit the household and horribly loses, being cast out of his family. Afterwards, he gets treated by the family groundskeepers and receives the family heirloom Gem from him that Lyles grandfather had entrusted to him. From there, he begins an aimless journey with his childhood friend and former fiance, Novem, and the Gem-turned-Jewel that houses the memories, personalities, and Skills of seven of his ancestors.