Finally, I yielded to the unending urge to make a fanfic about the Seven Deadly Sins and One Punch Man. Don't blame me for quality issues this is the first fanfic I made and I'm on mobile. Inspiration came from Warmachine375 and his fanfic Fairies and Sins. It's a really cool fanfic so please check it out. And now without further ado, let's get to it!

Chapter 1: The Arrival

On the outskirts of the One Punch Continent, (there's literally no info about its name so I just made that up) eight people and 1 pig are travelling on what seems to be a witch hat-shaped cottage. This cottage is on top of what seems to be a giant green boar, for some reason. In reality, this cottage is the Boar Hat, a fine drinking establishment with a reputation of horrible food (before Ban came along) but good liquor, which is run by the one and only Meliodas, midget leader of the Seven Deadly Sins. (I'm going to skip introductions since you all know who and what the Seven Deadly Sins + Elizabeth and Hawk look anyway)

"Are we there yet?" says Ban due to extreme boredom. "I'm not sure. Merlin, can you locate where we are?" the midget leader asked in response of the immortal's question. "Captain, it seems we are nearing a settlement. We might be approaching our destination." says the wizard with the very revealing outfit. "Remind me why we're here again?" a kid on a floating pillow asked. "King Baltra told us of a newly discovered continent and of a new vision about a certain golden-armored entity with immense power. We're here to explore and investigate. Just think of this as a vacation. Plus you could spend time with Diane, right King?" the midget captain explained. King stuttered and blushed at this, and attempted to retort, but all that came out was a babbling mess.

When they finally neared the nearby settlement, they all had different reactions, mostly shocked. One of them was Elizabeth's, but not due to curiosity but merely due to the fact that the place was smoking. "Umm… Sir Meliodas? Is the settlement okay?" the naïve princess questioned. "I don't know, but I'm going ahead to scout if there's any trouble. You guys should catch up soon." As he jumps of Hawk Mama and starts making his way to the battered city.

When he finally reached the city, he sensed a powerful presence and followed it. The trail led him to a broken battlefield, with a piccolo reject standing in the center. The piccolo reject suddenly conjures up a few glowing balls of energy and swiftly launches them towards a few buildings, effectively increasing One Punch Man's property damage counter. As the piccolo reject laughs maniacally, it takes notice of a crying little girl and tries to grab her, but to no avail. Meliodas caught the girl in the nick of time before she was destroyed by the grip force of the steroid-rich piccolo rip-off. "Oh? A little boy is going to battle me? And who might you be?" the copyright monster boomed. "The name's Meliodas, and I'm not a kid. I'm a Holy Knight." The captain of the Sins said seemingly innocently. "A 'Holy Knight' you say? A mere child with a ridiculous imagination is going to fight me? What a half-assed backstory! I was created by Mother Nature in order to fight back against the human race, born from their pollution! I am Vaccine Man! And you're going to fight me because of your make-believe stories?!" the copiccolo bellowed as it began a hideous transformation, with its spikes and teeth tripling in size and sharpness. The monster also grew to extreme levels, as it tried to annihilate Meliodas only for him to dodge with ease. Vaccine Man frantically attacked Meliodas at any chance he can, but could not even land a single blow. As Vaccine Man attacked and missed he got slashed by an unknown object. And then he was slashed again. And again. And again. And again. Every single time it missed it seemed he would get hacked at by an unknown object. As the piccolo reject stumbled down in pain, Meliodas landed on the ground, unscathed by Vaccine Man's attacks and revealing a curved shortsword with a dragon engraved in its hilt, however the monster itself was a different story. Slash wounds here and there, Vaccine Man had taken a lot of damage, unable to keep up with the stronger opponent. "Gah! Perhaps it's not make-believe. For now, at least." Bellowed the hurt monster. As the monster recovered, it unleashed a large ball of pure energy to strike its enemy down. As the mass if energy approached Meliodas, he shouted two words:

"Full Counter!"

Full Counter seemingly reflected the attack back to Vaccine Man, albeit double the power. Unable to defend itself as it was still in a state of shock, it was hit point-blank with a powerful energy ball. Narrowly escaping with a lot more injuries, Vaccine Man put some distance between itself and the midget captain. "So you can reflect attacks huh? Well let's see how you like this!" the piccolo reject boomed as it launches a volley of 5 energy balls at the same time. "Try reflecting that, asshole!" but it was in for a surprise. Meliodas seemingly splits into five and simultaneously uses Full Counter to reflect the attacks with double the power. 3 out of 5 balls hit Vaccine Man, but still enough to gravely injure it. As soon as Vaccine Man lands on the ground, it starts to recover and summons dozens of energy beams to attack Meliodas, while the latter began to dodge the beams swiftly while Vaccine Man launches even more beams. "DIE! DIE! DIE! DIE! DIE!" the piccolo reject screams in quick succession. After the intense bombardment, Vaccine Man scanned the surroundings to find his enemy, hopefully dead. His hopes are realized as he founds the body of Meliodas tattered and full of holes. "Perhaps I was wrong for even believing his stupid imagination." boomed the copiccolo. At that exact same moment, the rest of the Sins arrive and are shocked for a brief moment (except Elizabeth, because she was shocked for a long time) and ran to confront their enemy. Unbenknownst to Vaccine Man, the dead body of Meliodas quickly fades and reveals that it was a clone and that the true Meliodas was hiding behind the piccolo reject all along, and at the exact right moment, he shouted:

"Divine Slayer!"

After what seems to be a split second, Vaccine Man was sliced multiple times as if a master swordsman was his enemy. "Maybe you're the one without imagination. I told you Holy Knights are real." retorted the midget captain towards its earlier remark. However, it miraculously survives and begins charging its power. "IF I YOU'RE GOING TO KILL ME, MIGHT AS WELL BRING THE WHOLE CITY ALONG WITH ME!" boomed the deranged piccolo reject. "This is bad. Even Captain will have some difficulty repelling that attack." The revealing magician comments, watching from the sidelines, as Meliodas readies for the attack. Oddly, the attack never came. In the place of Vaccine Man was a huge fountain of blood and behind it was a bald man in a yellow suit with an outstretched smoking fist. The bald man then suddenly cried out, "DAMNIT ALL IT TOOK WAS ONE PUNCH AGAIN!" as he groveled on the ground. It wasn't until the baldy stopped wallowing when he finally noticed the awestruck expressions on their faces.

"So… who are you guys?"

Author's Note: There you have it folks! The very first chapter of the very first fanfic of the Seven Deadly Sins and One Punch Man. This is obviously an AU story. Please don't hate me because I am very tired since I wrote this at about 5 AM and I lost inspiraton halfway through. So yeah this fanfic will be set at the post-Kingdom Infiltration Arc but the Sins are on an assignment from the King and that they have their sacred treasures and Escanor tagged along. What would happen if Saitama fought The One? Stay tuned to find out and peace!