Black Iron Magician ~ Training Story of the Untalented Disciple ~

I have been transferring to different worlds for over a decade. The protagonist who became the Wizard of Translation, Derris Farrenheit, was singing freely about his life in this world. But one girl appears in hope of discipleship before him like that. She's also apparently a metastasizer - becoming the 　girl's master and revenge (?) A tale of transworldly transition that will develop disciples to accomplish.