Y/N die and get reincarnated to the world of supernatural, where devil, angel, fallen angel exist. Before he get reincarnated he meet the Shadow Monarch And The Real God
Morning have arrived, Y/N get a news about the rating game but he know they'll win. Y/N get up from his bed and start changing to his uniform, eat breakfast, drink his coffee before going to school
When he arrived at school, he sense a presence in the orc and he know that diadora is there, he doesn't worry at all because the necklace he give to akeno have a shield that block any attack
He come to the class where everyone waiting for him to sing, Y/N pick up his guitar and start singing
and few other songs, he stop when the teacher comes
Break time have arrived, he stay at the class singing and playing random notes. everyone in school getting used to the presence of Y/N and he happy with it because he doesn't have many times more in school, he want to make more memories in here before coming back to America continue his study in The Julliard School, New York
Night time have arrived, Y/N come to the orc after the peerage leave
Y/N : Let's move azazel, we don't have all night
Azazel : Yes, let's go you two
irina, rossweisse : Yes
Four of them teleport to the battlefield
Y/N : I won't hold anything back, come my shadows
Suddenly countless shadow soldier appear, killing anything in their way while our monarch is sitting on a shadow throne looking at them then he sense something powerful in the area making him smirk, he transform to his full power and go to the direction of the power. when he arrived he saw azazel and sirzechs with a girl
Y/N : Stop you two, that's an order
Azazel, Sirzechs : Lord Shadow *knee*
Y/N : Ophis, Infinite Dragon God. If you don't wanna die in my hand bow down now
Ophis : It's a pleasure to meet you, lord shadow *knee*
Y/N : I know your purpose, it's the dimensional gap isn't it
Ophis : No, my purpose is to show you my power so I can become your mate
Y/N shocked at this, because he only know that Ophis purpose is to kill great red
Y/N : I see, ophis. If you want become my mate you need to show your power, get out from here you two
Y/N summon his swords and ophis is in her fight style, 15 minutes have passed and our monarch is the winner while ophis ready to him to kill her that's what she think but surprisingly Y/N unsummon his sword and heal her
Ophis : Why?
Y/N : Your power is wonderful, I make you my mate
Ophis begin crying and smiling at the same time, then they see that Issei in his juggernaut drive and the orc in the sky with Vali Lucifer, Arthur Pendragon and Bikou, while arthur is carrying asia. Then vali sense Y/N and Ophis
Vali : Looks like The shadow monarch have acknowledged your strength
Ophis : Yes, with this the Khaos Brigate is disable
Y/N : Looks like the fight is over
Y/N and everyone look at issei that completely past out, they come down and see him, when he wake up rias hug him. Then Y/N sense something
Y/N : She is coming
Y/N said making all of them look at the sky where a big dragon is coming
Y/N : Great Red, The Apocalypse Dragon
Suddenly the dragon transform to a woman and run to Y/N kissing him
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Ophis : Hey you steal his first kiss, Red
Great Red : Yeay I finally meet you, please make me your mate too
Y/N : Alright girls, rule 1 no fighting ok
Ophis, Red : Ok!
With that the world become piece, Y/N come home with his mates. Before sleeping Y/N change his parents memories about the two dragons becoming mate/girlfriend for him
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Y/N L/N, The Shadow Monarch, The King Of Death, The Protector Of Humans, Dragon God's Mate, The Strongest Being In The World. The King Of The World, The Leader Of The Alliance Three Factions, etc.
Y/N wake up from beautiful dream and saw two of his mate beside him, he stand up and prepare for school, when he eating breakfast he saw two dragon come inside and they eat together, when he finish he kiss both of them in the lips before going to school
In the school, sport contest have start, Y/N get invited but he declined and just play music for them. After school Y/N get invited in gremory territory, it's not an important meeting so he didn't use his monarch armor, he come with his mates. after the meeting over Y/N meet a young devil named sairaorg
sairaorg : It's a pleasure to meet you Lord Shadow, Lady Ophis, Lady Red
Ophis : he is polite, i like that
Y/N : your power is good for young age, don't stop your training
sairaorg : it's an honor for me to get a compliment from you, Lord Shadow
Y/N : I like to see a good battle in the rating game young devil
sairaorg : I gonna do my best my lord
With that Y/N, Ophis, Red Leave the hell. When they reach the mansion ophis want some snacks so Y/N told the maids to bring snacks, drinks, and beer, they are relaxing together in the living room hearing music before going to the bed
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The next day issei and the others except rias and akeno going to kyoto, Y/N and his girls will come to later so he put a shadow soldier to their shadow. sona already know this and give a fake announcement that Y/N is sick
Then Y/N get a report from azazel that issei get attacked, Y/N told both his girls about this and he planning to come to kyoto this night
Meanwhile in a room that everyone is there, serafall tell them that the yonkai leader get kidnapped but azazel tell them that issei and the other student need to relax and enjoy kyoto
