While unofficial "ToonMixIndia" releases exist on social platforms, you can find high-quality official Hindi dubs on several platforms:
: Highlights Saitama's backstory—saving a child and training intensely for three years to become a hero. Official Viewing Options in India [ToonMixIndia]_One_Punch_Man_S1_E1_Hindi_Dubbed...
: Sony YAY! frequently broadcasts the series in multiple regional languages, including Hindi, Tamil, and Telugu. [ToonMixIndia]_One_Punch_Man_S1_E1_Hindi_Dubbed...
: Season 1 is available in Hindi on MX Player and via Airtel Xstream . [ToonMixIndia]_One_Punch_Man_S1_E1_Hindi_Dubbed...
: It showcases Saitama's struggle with boredom because he has grown too powerful and no longer feels the thrill of battle.