Juunenme, Kikan wo Akirameta Tenisha wa Imasara Shujinkou ni naru

Ten years after being transported to another world, Wasa Tooru has finally given up on finding his way back to Japan. What began as an exciting fantasy has become his everyday reality after countless failed attempts to return home. Just as Tooru accepts that he must remain in this parallel world, he receives an unexpected job offer: to guard a mysterious pair of twins. They possess rare knowledge of Earth, and their connection to his original world may offer him new answers—and a new purpose.