Manga by author Shichio Kuzu

Lucas has a hard life. In his mid-thirties, a mixture of failures has left him old and crippled, playing pack mule to a couple of young adventures.Then one day, he pulls a magic sword from a stone that tells him he has been chosen to become a hero. Given a youthful form, Lucas must use the power of the sword to vanquish evil and attain a massive harem.Before you ask, it's not isekai because he's been in this world from day one. It is wish fulfillment, though, so in the end it's basically the same thing.

"Classes" are given at the age of 10, and the presence or absence of "skills" greatly affect life. Arel, the son of "Sword Princess" Fara and "Magic King" Leon, has been branded as "Classless"... But even without a job or skills, Arel believes he can persevere through effort.

Solo adventurer and hero Leon was a master of all trades: sword-fighting, magic, healing, you name it. When he single-handedly defeated the Demon King, a curse was placed upon the lone hero. Without a party to save him, they both met their tragic ends.Years later, a timid noble boy is attacked by an ogre, triggering memories of his past life as the great hero who shares his nameLeon! With these memories recovered and powers reawakened, Leon decides to start a new carefree journey!