Isekai Oji-san

A man who had been in a coma for seventeen years suddenly awakens and returns to his nephew Takafumi's life. The uncle, now back, has an unusual passion for video games and reveals that during his comatose state, he was transported to another world where he served as a heroic guardian. Takafumi must now share a home with a magical uncle and help him understand twenty years of modern advancements, including smartphones, fast internet, contemporary anime trends, and the significant events of the ’90s console war.