Second season of Tsuki ga Michibiku Isekai Douchuu.

The Magical Kingdom of Klyrode summons hundreds of heroes from other worlds every year to fight in their war against the Dark One and his army of powerful demons. Banaza is one of those heroes, summoned from the Royal Capital Paluma, but something's not right—Banaza is only an average merchant. He has no magic, no fighting ability, and his stats are abysmal. Worse, a mishap leaves him unable to return home! Rejected as a hero and stranded in another world, abandoned to the far reaches of the kingdom by a cruel king who just wants him gone, Banaza's fate looks pretty bleak. But what will happen once the failed hero candidate finds himself with super cheat powers once he hits level two? (Source: J-Novel Club)

"The New Gate" is an online life-or-death game with tens of thousands of players. Thanks to Shin, the most skilled veteran player, the other players will finally be released from the game. Shin has killed the last boss and believes he is finally able to escape when he is blinded by a flash of mysterious light. He awakes to find himself in the game's world 500 years later! So begins a new chapter in the life of an unsurpassed legendary player! (Source: Alpha Manga)

It is common knowledge that it is best to become an adventurer when you are as young as possible because the magical power that is the basis of an adventurer's strength will hardly grow if you don't train it while you are young. But this man, Rick Gladiator, who became an adventurer when he was over thirty years old, had the combat power of an S-rank adventurer, the highest rank in the world. In fact, Rick has lived an unimaginable life with the members of the legendary Orihalcon Fist, a party of the continent's strongest adventurers. From dragons to vampires, Rick's fighting prowess, trained by his literal "monster" mentors, allows him to defeat elite adventurers one after another who try to underestimate him. (Source: MU)