{Please note that most of the story will be told in 3rd person}
Saitama, Class S Rank 1 hero, so much fans....Yet he is very lonely. He spends his days, Alone and Depressed. That all changed until....
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"Breaking news! A laboratory has unleashed a powerful monster in the woods of City Z! The damages are extreme and hundreds are injured"... Saitama sighed as he put on his gear and said, "Guess I'll go". When he had arrived, People were panicking as the monster advanced, causing mayhem. "Look! It's One Punch Man!", A man yelled out. Everyone began to calm down. The people from the Laboratory had tried to retrieve it but failed. Saitama noticed it had a collar with the Monster's name. "Shavocado?", Saitama said in confusion. "That's an odd name". "I'll end it quickly", He thought. He jumped up to the monster and gave it a good punch in the face, sending it flying backwards and hitting a building. Saitama looked to see where it landed and ended up being the laboratory where the monster had been created.
Once he knew it was dead, he walked a couple of steps before noticing a blue human shaped box with gear designs on it. The box also had a 'Do Not Touch' sign on it. "Automatic Robotic Housewife?", Saitama said with curiousity. He picked up the box and walked home. Then he tore away the sealing to see a Robotic boy with blond hair, a navy shirt, white pants and a frilly pink apron. "What is a boy doing in the box?", Saitama said. He tapped the boy's face. Then he paced the boy on the floor before The boy slowly opened his eyes before sitting up straight and looking at Saitama once before saying, "Owner identified". Saitama was kind of suprised. The boy got up, bowed and said, "Hello Master. I am a Robotic Housewife. My name is Genos. Thank you for choosing me". Saitama decided to play along. "Um..You're welcome?...", He said feeling unsure if himself. "I will be your housewife and I am grateful of your hospitality", Genos explained. Then a ring appeared on Saitima's hand. It was gold. "What's this?", He asked. "It's the housewife's master's ring. Its shows that I am yours", Genos said. He showed Saitama his ring which was identical. Saitama sighed. Looks like life is gonna change now.