The anime series ( Shikkakumon no Saikyou Kenja ) is officially available for streaming with an English dub on Crunchyroll.
You can find the dubbed episodes directly on their platform: Crunchyroll Watch Shikkakumon no Saikyou Kenja (Dub) Episod...
English Dub and Subtitled versions are both accessible. Episode 1 (Dub): The Strongest Sage Appears The anime series ( Shikkakumon no Saikyou Kenja