I do not own high school DxD
Issei will have his harem and then some list will be at the bottom
Will have some characters from other anime but only if I find it appreciate
Issei will not have a scared gear from the DxD but will have all the powers and the weapons of the seven deadly sin includes the DNA of the non-humans
In a nice little town called Kuoh we find a little boy about 5 years old with brown hair and eyes is about to play in a park when a girl that is about his age maybe a year or two older with long black hair and grey eyes runs into him the girl then looked up then said in a slight panic tone ''I am so sorry'' then run behind him gust as two male got there on tried to grab the girl but she didn't want to go with them as she seem to be trying to get away so he decided to help and get in the way which surprized all three of them
The first male looked at the boy and said ''hey kid get out of the way or you will pay for interfering in our business now scram''
The kid said in a slight terra in his voice ''not going to happen''
The second male said ''wrong choice kid'' then gave him kick in the ribcage with so much force that he went into a wall and the force brock his ribcage and the rib pierced his heart and lungs the last thing he saw before everything went dark was the girl still resisting the two men
Mindscape
The young boy woke up in a wide-open field with all kinds of flowers he looked around and saw a table with seven people one appeared to be flouting on a pillow and was a boy and one was many times bigger the others and was a girl, so he decided to walk up them to find out where he was as he got closer he could tell that four of them was male, two was female and the last one he couldn't tell the gender
Then one of the females who had black hair and gold eyes noticed him coming them said to the others ''look who is here'' and all of them turned and looked and saw the boy
One of the others got up who had blond hair and green eyes walked up to the kid as said ''yo how are you doing Issei''
Issei looked at the blond then asked in a scared tone ''how do you know me, where are we and who are you people''
''well first where are we and how we know you is simple as we are inside you as this is called a mindscape as for who are we, we are the seven deadly sins and my name is Meliodas'' said Meliodas
''okay how am I here and you lot as well'' asked a confused Issei
''well you are here because you are on the verge of death as you tried to help the girl'' Meliodas began to explain
Issei interrupted in a sad tone ''oh man I am going to die, and I didn't get to protect that girl''
''calm yourself boy you are not dead yet and time moves differently in here now'' the black-haired lady said
''oh, okay how did you seven get in my mindscape then'' asked Issei
''well for us to explain that you need to know our history so sit down and we will explain'' said Meliodas '' Merlin if you please do the honours as you seemed to know more''
''Sure, I will captain'' said the black-haired lady now known as Merlin then turned to Issei ''okay Issei I would like to save the questions till I am done okay''
''okay I will try my best'' Issei said
''good'' Merlin said then began to explain ''okay to begin you need to know that there are other universes then the one that everyone is born in and we come from one of those universes it is similar to this one yet different the universe we come from has five races there are the human race, the fairy race, the giant race, the goddess race, and the demon race and some of our weapons have magic we call sacred treasures in our time there was two great war and it was the demon race against the other four races the first one ended in a stalemate as the demons race was sealed away then 3000 years later when the seal was destroyed the war restarted in the end we seven sacrificed ourselves to separate the five races into separate realms and the goddess races decided to send us in to this universe now any questions''
''Okay'' Issei said then asked in a confused tone ''what do you mean similar to this one''
''Well for you to ask that then you have no idea that the myths and legends of this universe is real but back in our universe most people have some kind of magical power we call abilities'' said a male with pale blue hair and red eyes
Issei said ''sweet so what happens know''
''Well we are going to become one with you and you will gain our power and weapons and the knowledge how to use our attacks also your DNA will chance as some of us are not human'' explained Merlin
''so, you are the seven deadly sins but who and what are you'' Issei said
''well as you know my name is Meliodas, my sin title was the dragon sin of wrath, I am of the demon race, my sacred treasure was called lostvayne a short sword and my abilities are full counter which send any magical power back at the caster at double strength when I am normal and when I was my demon power it becomes hellblaze it is a black fire of the demon race that cannot be put out until there is nothing left of the thing that you burn'' Meliodas explained
Then the giant girl laid down, so she was more or less eye level and said ''my name is Diane the serpent sin of envy my sacred treasure was called Gideon a war hammer and I am of the giant race and my ability is creation which allow you to manipulate the earth''
The male with the pale blue hair said ''guess it is my turn I am the fox sin of greed ban was an immortal but I gave that up to keep my beloved Elaine from death the second time which you will have my sacred treasure was called courechouse a four-sectioned staff I and my ability is snatch which allows you rob objects in an area it also lets you rob the physical abilities like speed stamina and raw strength''
The flouting boy then said ''my name is Harlequin, but I go by king the grizzly sin of sloth, and I am of the fairy race my sacred treasure was called Chastiefol a spear that can change shape, my ability is called disaster it give us the power over live and death as it can turn a scratch in to a severe wound mild poisons in to lethal toxins and a small tumour to rapidly spread''
the one that he couldn't tell the gender came up and said ''one of the seven deadly sins I am the goat sin of lust my name is Gowther I am a doll my sacred treasure was called Herritt a twin bow my ability is invasion it let you enter somebody's mind and you converse with their subconscious or can alter their memories''
''now it is my turn I am Merlin and am the boar sin of gluttony I am what you would call a former human my sacred treasure was called Aldan crystal ball and my ability is infinity it can stop time on anything as long as I wish'' merlin said
The last one who had way too much muscle then humanly possible walked up then said with pride ''greetings I am one of the seven deadly sins the sin of pride and my name is lion sin Escanor the sacred treasure I use was called Rhitta a battle axe adored by the sun bearing the name of a maiden and sunshine is the name of my glorious magical power that will steadily increase and decrease depending time of day and the power belonged to one of the archangels''
''wait so you are the reason why I have the seven crimson animal birth marks'' Issei said
''yes, now that is done, we all know what to do and Gowther leave Meliodas till last as he can take care of the two devils and take Issei back home that Issei is if it is okay with the boy first'' Merlin explained
''Yes, it is but on wo conditions'' Issei said
This got Meliodas's attention and said ''and what would they be''
''firstly, can you please take the girl with you when you go home'' gaining a nod from Meliodas ''and the second is I want you to explain everything to my mother please, so she doesn't worry if the weapons just show up'' Issei said
''consider it done'' Meliodas said
Real world
It may have been hours in Issei's mind, but it had only been a couple of minutes the eyelets of Issei opened they wont the usual brown they ware green which indicated Meliodas was in control he got and looked around to see the two devils still trying to get the girl to go with them he then lunched himself at the devils and gave the one that kicked Issei a punch in the head and send him flying the other one saw and was about to attack but Meliodas used his demon power to scare the devils away which worked then he walked up to the girl and said ''yo please come with me'' then started to walk to the Hyoudou residence
After a fifteen-minute walk in silence the duo walked thought the door and meet with Issei's mother Miki
Miki saw Issei she was about to ask how he was but when she saw the eyes she asked ''who are you and what have you done with my son''
Meliodas said ''mind if we have a seat as it is a story'' Miki then led the two to the living room where Meliodas introduce himself then explained everything from the meaning of the seven crimson animal birthmark to what had happened at the park and how he was in control of the body under the two conditions and the weapons that he placed on the table then he got up and said '' now I am going to bed then let Gowther finish of the transformation'' then looked at Miki before saying ''one more thing Issei will be out for a couple of days so his body can get used to our power so you might want to be with him with a cold press and to make sure he is okay'' he then went upstairs to bed
Miki then looked at the girl and asked ''so who are you then''
The girl then said ''I am Ophis and I and the ouroboros dragon the two men that was trying to get me were devils and they promised me they will help me if I gave them my power but I had recently learned that they gave me an empty promise so I took back my power and run but they had found me so I run but I didn't get far as I run in to your son who tried and protected me but that didn't go well the first time''
Miki ''Ohh you poor little girl do you mind if I asked what the promise was''
''I wish to reclaim my home'' replied Ophis
''and where is your home Ophis'' Miki asked
''My home is the only place I have known silence that is the void'' Ophis replied
''Ohh dear that sounds lonely how about you stay with us as a home is never where you was born but where the heart is'' Miki said and then took ten minutes trying to get Ophis to agree then went upstairs and took care of Issei
Over the next few days Miki took care of her son with the help of Ophis on the five day when Miki went to check her son he was sitting up in his bed and seeing as he was okay, and told him everything that Ophis had told her
The next day Miki sent Issei to school then when she got home she made plans so he know use his powers and how to protect himself and there was only one place the trusted so she went to the phone and rung someone after it rings a couple of times someone answered in an old voice ''hello how may I help you''
Miki, who was nerves, took a deep breath then said ''hello my name is Miki and I need your help….''
After the school day was finished Miki went to pick up Issei when they got home Miki sat Issei down and said ''now Ise we need to talk''
Issei looked at his mother and asked ''what about''
''About your future'' the mother replied ''I am sending you away to train so you can get used to your new strength and power but don't worry about schooling you are going to be home schooled until you are fifteen''
''If you think that it is best then okay'' Issei said in a sad tone as he didn't want to leave his mother
''Hey no need for that I will be visiting for your birthday and I will be around for Christmas and every change I can get for that I promise you'' said miki trying to cheer up her son and it did work ''now let's go and get you packed''
When they was up the stairs and packing when Issei remembered something then look at his mother and said ''hey mum what is going to happen to Ophis when I am training''
''why she will be with you as she asked me about it and is already there'' replied the mother
A couple of hours they are in the county side in front of a big dojo when Miki walked up to the front door and pushed it open then with Issei went to the living room where they met a big old who appeared to be waiting for them when all of them sat down with Issei trying to hide behind his mother the old man noticed this and said in a grandfatherly voice ''now now young one no need to be scared of me I wouldn't harm you outside of training that is''
Miki noticed he didn't calm down ''Now Issei let me introduce the master of this dojo Hayato Furinji my father''
This calmed down Issei a little looked at the old man and said ''are you really my grandfather''
''yes, I am here have a sweet'' Hayato said as he gave his grandson a sweet then spoke again ''now do you know why you are here''
''yes, to train so I can get used powers and weapons that I got from the seven deadly sins'' Issei replied
''My you what a smart little boy have another piece of candy'' said the old man ''but do you know here''
When Issei shook his head, Miki said ''there are a couple of reasons but the main one is I trust nobody more than my father''
Flashback
there was only one place the trusted so she went to the phone and rung someone after it rings a couple of times someone answered in an old voice ''hello how may I help you''
Miki, who was nerves, took a deep breath then said ''hello my name is Miki and I need your help father''
''now this is a surprize how are you doing Miki'' Hayato said in a joyful and surprized tone
''I have been good considering'' Miki said in a down cast tone when she said that in the tone, she hope that he didn't catch the tone
''what happened'' said Hayato as he had catch the tone, she had used
''You was right dad'' was all she said, and he knew what had happened ''Gorou was a bastard he left us four years with a younger woman, and we are not doing well financial wise ether as he left us with no money''
''Then why haven't you called and asked for some money and what is this we stuff'' asked Hayato
''well that is the reason I had phoned you; you see I have a 5 year old son and he had recently came into something that I will not go in to over the phone so I phoned you to let you know that I am dropping round'' Miki explained
''okay see you in a bit sweetie'' Hayato said and the hang up
''so, what are you doing miki'' asked Ophis
''I am going to see my father and ask if he could train Issei'' Miki told Ophis
''do you mind if I tag a long'' Ophis asked
''I don't mind'' Miki said
About an hour later Miki was in front of her childhood home the Ryozanpaku she took a deep breath then entered then went to the main room where there was six people waiting Hayato said ''ahh Miki it is so nice to see you again''
''Same as well and to all of you as well'' Miki said ''now then let's get down to business shall we'' after getting a nod from the six masters she explained everything that Meliodas told her ''and that is why I need the six of you to train my son''
''We will do it, but you hadn't answered my question why hadn't you called and let me know about you problems'' Hayato asked
Miki looked unsure about the answer ''I don't know my best guess might be I didn't want to hear I told you so or might be I felt like I let you down somehow'' then look down ashamed
''Do you mind giving us a little privacy'' Hayato asked the other masters who all got up and left then moved in front of Miki and gently grabbed and lift it up so they was looking into each other's eyes then said ''honey you haven't let me down it is true that I tried to worn you but you stuck to your guns and told me where to go just like your mother did and remember this know matter what happens I will always be proud of you'' that was all that was need to be said before Miki lunched her self into the loving brace of her father and cried after twenty minutes before Miki calmed down and got the other masters talked about a plan as long as they don't wake him up at an ungodly hour so any time before half six and in bed at a reasonable time so no later than eight thirty and have the weekend off to be a kid all was good that is until his teenage years then there was a bit of small talk Ophis was introduced and so was al; of the masters
End of flashback
''So now you know that your mother know that this place is the best chance for you, and we will not start you training till Monday so we can see what we are dealing with how does that sound'' Hayato said
''Sounds good to me grandpa'' said an excited Issei
A few hour later Issei and Miki said their goodbyes so Issei can get ready to train
The harem is as fallows Rias, Akeno, Keneko, Kuroka, Xenovia, Asia, Irina, Rossweisse, Grayfia