In the midst of his daily life, Thor, a former Japanese citizen, was suddenly transported to another world. In order to find a way to return to Earth, he continued to work as a solo adventurer, and before he knew it, nine years had passed. Now in his tenth year of living in another world, Thor has finally made up his mind to bury his bones in this world. At that moment, he receives a top-secret request from the head of the Adventurers' Guild, who is impressed by his abilities. He is asked to protect the beautiful and intelligent twins, Yuffie and Merry, from Harlan, the man who controls the trading company they have inherited! Thor decides to lend a hand to the twins and demonstrates his polished skills...? ( The 10th year of life in another world is going to be a lively journey ) The otherworldly adventure tale of the strongest adventurer with thunderous roars and the beautiful twins with a clear head is here!