Moto Saikyou no Kenshi wa, Isekai Mahou ni Akogareru

Soma, the world’s strongest swordsman, is killed in a battle with the toughest opponent imaginable: The Dragon God. On the verge of death, his only wish——to be able to use magic——is granted by the God…. but with a catch. He has to be transmigrated to another world, where he must take the form of a six-year-old kid with apparently no skills at all!