(I've not seen any Fate anime so i'm very sorry i get something wrong.)
RING!! RING!!!

Dante: Devil May Cry? A copy of Jeanne? How much? 75k? Deal.

Y/n: a copy of Jeanne? Odd.

Jeanne: why her out of all people!?

Nero: what's wrong?

Jeanne: nothing she's very aggressive in her battles.

Y/n: oh....okay.

They left went to the RV where Nico is in the driver seat.

Nico: hey nice to see you again Y/n!!

Y/n: nice to see you Nico. Is the motorcycle ready.

Nico: yep s-she's all yours!!

Y/n: thanks!! come on let's catch that copy of Jeanne!!

They drove to the location of Alter Jeanne D Arc.

(Meanwhile)

Alter Jeanne: tell me or you'll be burned to death!!

Then the RV arrived in time. Everyone got out and ready up their weapons.

A.Jeanne: where is He!?

Bayonetta: he? You mean my son?

A.Jeanne: yes I want to fight him!!

Dante: well she's a very thirsty woman.

Jeanne: I'm not letting you have my Y/n!!

Saber: why do you want to fight our Y/n!?

A.Jeanne: take him and make him my lover!!

Mashu: huh!?

Jeanne: what?!

A.Jeanne:*yandere giggles*

Dante: Stinger!!

Powerful thrust unleashed after stepping forward as A.Jeanne blocks it but caused her to lose balance. Then Trish sweeps A.Jeanne but jumps back on her feet. Lady shot a rocket towards her but she dodged it.

A.Jeanne: MINE!!

She swings her sword to her counter-part as they glare at each other.

Jeanne: GRRRRRRRRR!!

A.Jeanne: HE'S GONNA BE MY KING!!

Vergil: scum.

She used Rapid Slash dashing forward, relentlessly slashing everything in her path. This caused more pain but A.Jeanne smirks and slams Mashu into the ground. She swings her sword but Y/n blocks it with his back causing blood to come out of his back.

Saber: Y/n!!

Y/n: I'm fine!!

He turns around his his back heals.

Y/n: sorry for the waiting A.Jeanne. Here it comes the hollowfication that you want to see so badly....then so beat it.

[There should be a GIF or video here. Update the app now to see it.]

Y/n: RHAAAAAAAAAAAAAAA!!!

He charges to the Alter of Jeanne and swings Tensa Zangetsu clashing to her sword but it starts to show cracks and she jumps away.

A.Jeanne: what is that!?

Y/n: YOU ALREADY LOST!!

He went faster and slams Alter Jeanne to ground causing a shockwave as his mask crumbled into 1/4.

Y/n: hehehehehahahaha!! This is so much to beat the hell out you!! I'M ZANGETSU!!!

The mask vanished and Y/n picks up a knocked out Atler Jeanne.

Bayonetta: interesting mask Y/n.

Y/n: well that's what happens when those bastards betrayed me.

V: we should get our payment.

The person came out and hands them a briefcase with 75k dollars. They left and rest for the night.

(Morning)

Y/n:*yawns*

????: don't touch there Senpai~

Y/n: sorry-wait what!?

He looks around on his bed and sees three girls on his bed.

Y/n: what the hell!?

????: hello Onii-chan!!

Y/n: you are?

Ren: Ren and I'm your sister!!

Y/n: wait you're my sister?!

Ren: yes i can finally be with you!!

Y/n: you two are her friends?

Yu: yes that is correct.

Minato: oh yeah your mothers told us that you're going to school.

Y/n: wait a normal school?

Ren: no a school were people with powers like magic or something that is supernatural like demons and angels.

Y/n: so what's in called?

Yu: Aura Academy.

Y/n: that's cool but no thanks. Not my thing to be at school where some orange haired gaylord who is racist to some sweet bunny girl.

Minato: okay one that's on some fanfic stuff where RWBY is used way too much.
(P.s RWBY x male reader fanfic is way too much for me)

Dante: son you need to have some education. There's many demons who we don't know their weakness but they know us because of our bloodline.

Y/n:*sigh* okay but i'm doing this for you.

Dante: thank you.

Y/n: when do I start?

Minato, Yu and Ren: NOW!!

Y/n: wait huh!?

(Timeskip)

Ren: here we are Aura Academy.

(Forgot that the academy is in Japan)
Y/n: I'm gonna die here.

????: so you must be Ren's brother?

Y/n: you might be?

Mitsuru: I'm Mitsuru Kirijo nice to meet you Y/n Sparda.

Y/n: great now everyone is gonna stalk me!!

Yukari: hey Minato!!

Minato: oh hey Yukari nice to see you today. How's SEES?

Yukari: some old, Fuuka and her cooking, Junpi doing baseball practices.

Yu: well you should be in your first class.

Y/n: oh....where?

Mitsuru: let me show you Y/n.

(Meanwhile)

Female Student: you heard there's a new student?

Male Student: yeah i think it's a guy.

Female Student: i swear if it's gonna be a another pervert!!

Y/n: sorry i'm late hi I'm Y/n Sparda. If you want to be friends sure but it has to be a reason not just because i'm a Sparda.

Rossweisse: nice to meet you Y/n Sparda.

Y/n: you must be my teacher correct?

Rossweisse: yes your desk is at the end and your partners are Kirito, Eugeo and Aether.

Y/n: thank you.

He walks past the other students and arrives at his desk where he sees his new classmates.

Y/n: you three are my new classmates?

Aether: yeah nice to meet you.

Kirito: so you're the new student?

Y/n: yeah well my sister tried to force me to going but my mom want me to have a education because some demons might hear of my Grandmother Sparda.

Eugeo: that sucks to have many demons knowing your bloodline.

Y/n: well i'll have to kill them so i don't have to hear them all dam day.

(Mini-Timeskip)(Lunch/Outside)

Y/n: the lunch is way better like 5 star rank type vegetable.
(If you watch RussianBadger then you get a gold star)

Ren: so how's the lunch?

Y/n: better than having pizza everyday. Mom(Dante)really needs to stop with the pizza.

Then they heard some male perverted voice.

????: man the girls have big tits....

Y/n: how's he?

Aether: Issei Hyoudou, a reincarnated devil.

Y/n: reincarnated devil? How?

Ren: what i heard if a human dies a pure blood devil will ask him or her to join his/her peerage but reincarnated as a devil.
(I'm still new to DXD)

Y/n:*hits his head*

Aether: Y/n?

Y/n: i'm fine also he's not that strong his demonic game is weak.

Aether: yeah but he has Ddraig the Red Dragon Emperor!!

Y/n: still if he's a pervert. He only cares about boobs and not training. Ddraig regrets his actions.

Aether: here he goes again peeping on the girls.

Y/n: hold on i got this.

He walks towards Issei and pulls him on to the ground.

Issei: what was that for!?

Y/n: you're real that perverted? No wonder many writers in fanfics hates your guts!!

Issei:*summons Ddraig* why you!!

Y/n: your power is weak game. You'll be killed because your mind is filled with boobs and becoming a harem king? One other people already did that. Oh i forgot the girls are behind you.

Issei: what!?

Y/n: girls here's some tasers and a nutcracker.

He leaves as the girls beat up Issei as he screams.

End of chapter