Red

After defeating the Breakup King once and for all, he finds himself unharmed in a world of magic and chivalry. While searching for a way home, he discovers that this world is plagued with the many of the same problems as his own world. And so he vows to protect the innocent and help anyone he can as an adventurer until running into Idora Arvoln, who hires him to help her with her magical research. https://isekai.fandom.com/wiki/The_Red_Ranger_Becomes_an_Adventurer_In_Another_World