Isekai Kaeri no Daikenjasama wa Sore Demo Kossori Kurashite Iru Tsumori desu

Saito was reincarnated to the other world at the age of 15 becomes the Great Sage and defeated the Demon Lord Shortly after that the door connecting the other world and the real world opens and Saitou return to Japan with the power of the Great Sage However 19 years have passed in the real world Saito who was drifted away for so long met his childhood friend Kanako whos now a single mother But it seems like theres someone whos targeting Kanakos life A story of a slow life wannabe Great Sage who came back from another world begins