(MC POV)
in the city of kyoto on a old orpahanage a 3 year boy was trembling and acting very strange, suddenly the kid open his eyes looking in confusion the room he was at.
mark: where am i?
our protagonist didn't have to wait for the answer before a head splitter headache assaulted him, the boy couldn't even scream before fainting because of the pain, last thing he could hear was the scream of a woman in the door of his room.
mark: now where the hell am i
mark found himself in an hospital room, sitting in the bed he was mark started to remember all the memories of the boy and very vast information about mechanics.
mark: so my name now is daiki fujimoto huh
aiki fujimoto was an orphan because of a car accident making him the only survivor in the crash, aiki fujimoto had the appearance of denji from the manga chainsaw man with yellow hair and light yellow eyes, because aiki was a kid he didn't have sharp features making the kid look cute with puffy cheeks, but with a glance one can say that the boy will be a lady killer in the future
aiki: so i have the appearance and powers of chainsaw man, neat.
aiki then started to revise his body until he found in the middle of his pectorals he found a black string with a triangle holder, aiki couldn't help but smile seeing the string, he contained himself of pulling the string because that will bring him unnecesary trouble.
aiki: so this is where all starts huh, this time i will not become the dog of anyone and will live a happy life . . . and squeeze some good pair of tits.
aiki got up from bed and went to the door leading outside when he exited the door he found himself staring to an old woman with a food tray.
???: aiki you finally woke up are you okay, i found you laying in the floor of your room do you feel anyhting wrong in your body?
aiki: don't worry sister, i'm fine i just hit my head hard against the floor
the old woman that aiki had in front of him was the only care taker in the orphanage that's because the income that the government gave to them was too poor only giving them enough for food and water.
sister: but just to be sure aiki stay on bed today okay?
aiki: yes sister.
aiki then started to walk to his room, then he sit on the bed thinking about the things happening.
aiki: if my memory doesn't fail me kyoto is the city were youkais resides and looks like i'm 1 years older than issei the mc of dxd, that means i have 13 years for training and to gain fame on the underworld, but first i will have to adapt to my new powers.
aiki waited until night, when night finally came aiki escaped the building bythe window he had in his room, then aiki went to the forest that was close to the building.
aiki: okay let's do this.
aiki took off his t-shirt showing his childish body and the string, aiki hold the string with his right hand and with a long breath he pulled the string the sound of engines can be heard, suddenly the boys arm were divided in two showing the chainsaw that was protruding from that gap and the kids head was cut open showing another chainsaw, the chainsaw in the head of the child started to take the form of a helmet, now the face of the kid had an open mouth showing the sharp looking teeths and the tongue was so long that was outside of the mouth, in his forehead there was a chainsaw that was shining with the light of moonlight in place of eyes he had slits, and instead of skin in his head he now had a carcase of a orange color.
aiki: hahahahahAHAHAHHAHA THIS FEELS AWESOME!
this is was the start of the man who challenged gods, angels, and devils with just a chainsaw