Setsuna no Fuukei

After being summoned to another world as the 68th hero in order to protect the world from monsters, Setsuna Sugimoto is abandoned because of his weak and sickly constitution and waits for his inevitable death. But when he meets Kyle, the former 23rd hero, he is given another chance at life and inherits Kyle's vast knowledge, power, and life force. Having finally gained the freedom to travel the world, Setsuna embarks on a journey as an adventurer, where he'll encounter all walks of life, meet new people, and say good-bye to others—each one bound to leave their mark on him and the world.

(Source: Yen Press)