There is a story called High School Titans that is what if the Attack on Titans world was also in the High School DxD world. That one didn't took too seriously, because they treat titans as something like an infestation and nothing more. But there is real charm and fun there and I want this to be a new idea. Also, the idea of someone in a harem actually keeps the others away from the main boy, this is something really funny and Mikasa is someone that shouldn't be looked over at. This will have a bit of regular Attack On Titans, a bit of the humor from Junior High and the fan service from high School Dxd.

This is in AU, where Eren and Mikasa are starting out High School in Kuoh, and instead of dragon and Booster Gear Eren has the powers of a titan while Mikasa is something else. There are other characters that will appear around and tell me if you want them to be either angel, fallen Angels or something else. Now lets get this shown on the road.

By the way, do you guys want me to keep with a nice Eren or do you want in the future that I make him the dark and edgy one that causes genocide. This would be original, a harem story where the girls at the end feel horrible because ´´oh crap, I feel in love with a monster´´. Well lets see.

On Kuoh City.

The city was mostly known about the national famous Kuoh Academy, a school most well known for having some of the best grades and most well known graduates from around the nations. However some dark secrets are around the famous school and now it was about to get something more.

At the Yeager Household.

A boy named Eren Yeager who was 17 years old was about to start his first day at Kuoh Academy. The problem was that he overslept and now was rushing a lot in order to get there in time.

''Eren are you ready?" Asked his mother

''Coming!'' Said Eren putting his uniform in a rush.

The boy felt like a looser that he overslept on the first day on the new school. His family has moved to the new city because of his father new job. He wanted to make a good impression on the new school and he didn't wanted to look like a schumck like he did at middle school.

''Oh shoot I can't find my sock!'' Said Eren all nervous.

''Eren are you ready?" Asked a new voice.

The voice belonged to Eren adoptive sister Mikasa Ackerman. She was a beautiful girl with a nice bust, short black hair and pretty face. Eren always saw her as the person that he could trust the most ever since his best friend Armin went to study overseas.

''Mikasa, don't tell anyone I overslept!'' Said Eren nervous.

''I promise.'' Said Mikasa.

''Thank you.'' Said Eren feeling better.

Soon Eren got all the last part of his uniform and now he was ready.

''Ok I am ready!'' Said Eren super excited.

''Eren your zipper is open.'' Said Mikasa blushing a little bit.

''Oh crap!'' Said Eren closing the zipper.

After that the two rush off to school.

''Have a good day at school darlings.'' Said their mother.

''thanks mom.'' Said Eren.

''Bye!'' Said Mikasa

The two soon rush off towards Kuoh Academy, they were in a rush if they wanted to make in time and know the place.

''Come on Mikasa! We need to run!' Scream him.

''Eren this isn't the way.'' Said Mikasa.

''I know it's a shortcut!'' Said Eren.

''Ok, but if we get lost I will guide us next time.'' Said her.

In the end the shortcut worked but Mikasa didn't fully trust Eren and his guiding skills. That's why she always walk around with a map.

At Kuoh Academy

The school was once an all-girls place, but now it was co ed. A lot of people aim to get into this place and now Eren and Mikasa were one of the many

''Look at this! Its amazing, its three times bigger than our middle school.'' Said Eren.

''Come on we need to get our timetable before classes.'' Said Mikasa.

The two walked around seeing all types of students in the school. Eren was impressed to see so many people, while Mikasa just wanted to make sure that no girls try anything with Eren or they will suffer her wrath.

''Excuse me, do you know where we can get our timetable? We are new here.'' Said Eren to a teacher.

''Over there.'' Said the teacher.

The two walked to towards a room at the end of the hallway. There was only one thing written at the door.

Student Council.

Knock Knock

Once they knocked at the door they were greeted by a tall boy with black hair and a elongated face. (AN: I am the only one that thought that Bertolt and Marco looked a lot like?)

''Hi there you must be the new students.'' Said the boy.

''oh hi I am Eren Yeager and this is my sister Mikasa. We came here to grab our timetables.'' Said Eren.

''Don't worry I will grab for you two, my name is Bertolt by the way.'' Said him.

''Oh thanks Bertolt senpai.'' Said Eren.

''Here.'' Said him handing the two their class schedules and where they would seat.

''Thanks.'' Said Mikasa.

''Nice to meet you two, enjoy Kuoh.'' Said Bertolt.

''Bertolt what did I said?!'' Asked a serious voice.

''Sorry about that. You two come here, the president would like to speak with you two.'' Said Bertolt.

The two soon enter the Student Council and saw a girl with short hair and glasses standing up and looking at them with an analysis look.

''You two must be the new students. I am Sona Sitri, I am the Student Council President.''

''Nice to me you Sona senpai.'' Said Eren.

''The same.'' Said Mikasa.

''Well I hope you two enjoy Kuoh, but I want to make it clear that if something happens you two can come here to speak about it.'' Said Sona.

''Thanks for the advice...'' Said Eren.

''You two are dismiss, I hope that Kuoh will pleases you two.'' Said Sona.

''We will do our best.'' Said Eren.

''Welcome to the school, I hope you like some good old sport spirit.'' Said Bertolt with a smile.

''Thanks Bertolt.'' Said Eren.

''Let's go Eren.'' Said Mikasa.

As the two left Sona kept staring at them. Pretty much looking like someone ready to finish a test.

''So President what is our next…' Asked the vice president Tsubaki but Sona wasn't in the mood for this type of talk.

''everyone come here!'' Said Sona.

The entire student council soon went to their president, but this wasn't about school business.

''What is it President?" Asked Tsubaki.

''One of the two have Titans powers.'' Said Sona.

The news shocked everyone. Specially three members: Bertolt Hoover, Reiner Braun and Annie Leonhart.

''Really?! Its like ours or…'' Said Bertolt in shock.

''No, but I can tell it's a strong. I guess it's the boy, the girl is another story.'' Said Sona.

''Ok, but what do we do?" Asked Annie.

''Annie, Bertolt, Reiner I want you three to make sure that nothing bad happens if he awakens his titan. The last thing we want is a monster rampage and eating people.'' Said Sona.

''Yes president.'' Said the three.

The Student Council would soon get back to work, but now they felt a little nervous knowing that there was another student with Titans powers.

At the hallways

Eren and Mikasa found their class, much to the two happiness they were in the same on.

''Oh so this it.'' Said Eren.

''Yes.'' Said Mikaa.

The class soon started and the gossip about the two new students were already being spread. Specially by the infamous pervert Duo of the school or the Kendo duo.

''These are the new students?"

''Yes, look how hot Eren-san is?''

''She has a nice rack and butt.''

''Oh she is going to make me have sniff that scarf.''

''Ok everyone settle down. We have a lot to discuss today.'' Said the teacher.

The class went normal as ever. Eren was a bit nervous about getting some attention while Mikasa wasn't bother at all by that.

Later

''Man classes in here are no joke. I had some troubles keeping up. What do you think Mikasa?" Asked Eren.

''Its was ok.'' Said her.

The two soon passed around some old building near the school ground. The place looked like it need it some new set of paint and a new structure.

''What do you think that building is?" Asked Eren.

''I don't know.'' Said Mikasa.

''Well it sounds cool, I wonder if there is someone in there.'' Said Eren.

Mikasa then saw someone in the old building, a beautiful red-haired woman. She was staring at them, the girl didn't like that at all and decided to move on.

''Let's go!'' Said her taking Eren away from her view.

''Wow Mikasa calm down, I don't want to lose an arm.'' Said Eren.

The two soon left the area near the old building and back to the main school.

At the old school building.

The place was where the Occult Research Club resided, but the club was a front for Devils who studied at Kuoh. The president Rias Gremory is a pure blood devil and was looking around for new members.

''I got admit I am impressed.'' Said Rias.

''What are you saying?" Asked Akeno Himejima her vice president.

''That girl over there has great reflexes and perception. She noticed me in a heartbeat.'' Said Rias.

Soon Rias childhood friend/rival appears, Sona Sitri the other head devil in the school.

''Sona what do I own this pleasant surprise?" Asked Rias.

''We got some serous news.'' Said Sona.

''What is it?" Asked Rias

''The two new students, they are both powerful.'' Said Sona.

Soon both Rias and Sona were looking at files about Eren and Mikasa, looking for some clue.

''Eren Yeager, regular kid with nothing special. His father is a scientist that got accepted at Kuoh University to teach biology classes.'' Said Rias.

''And the girl?" Asked Akeno.

''Mikasa Ackerman, she is his adotopive sister. She with them since she was only 9, not much is said about how they meet, but it says here that she is protective.'' Said Akeno.

''Are you going to tell me what this is about?" Asked Rias

''Uh I could tell or not.'' Said Sona.

''Ara Ara please dodnt be rude Sona-chan.'' Said Akeno.

''Yes, after everything you need to be clear about some things.'' Said Rias.

Sona took a deep breath and told Rias the big one.

''Like some of my peerage…one of them have titan powers.'' Said Sona

The news shocked Rias and Sona. People with Titans powers were rare, Sona got three because she rescued them a few years ago. This was something that Rias deeply envy on her rival, but now she might a titan as well.

''Oh that's it interesting.'' Said Rias drinking her tea.

Well this is the start of a new story. This will be something pretty cool, also its going to be fun to see a possessive girl fighting against others for the same boy. Like that never happens in the main story. Also do you think I should still have Issei but he is another school and he is still the red Dragon? We are dealing with titans here.

By the way, do you guys have any plans for Jean, Connie, Sasha, Marco or some others. Like I have a plan for Historia and Ymir. Hitch and Marlowe also, Levi and his squad, but some of the regular groups are giving me some blank on my head. I want this story to be most comedy first before we have the horrors to come.

To celebrate this new story, have a taste of this Omake.

Omake

So for this omake lets go into the future, where the Yeager household is full of girls.

Eren was sitting on the dining table. All nervous because most of the people there wanted to feed him in a cute matter which would make him blush.

''Girls please, we don't need to do this.'' Said Eren blushing.

''Oh come Eren, you need to eat. Now open your mouth. '' Said Rias all seductive.

''No, Eren-kun is having some of my food. '' Said Akeno

''Have some please. '' Said Asia

''Eren senpai, do you want mine?'' Asked Koneko

''Please Er, I want to share this lovely meal with you!'' Said Irina

''Come here, I want to give some of this food too.'' Said Xenovia

''No, you need to eat this. It's some of the best rice in town.'' Said Ravel

''I can also feed you dear, here. '' Said Roseweei.

Eren was now super nervous. Even after a while he couldn't fully be comfortable with all this female.

''I need to look at something in the kitchen!' Scream Eren running off.

The girls just look at that and some of them pout.

''No fun.'' Said Xenovia.

''Yes, why doesn't he take a move? We love him!'' Said Irina.

''Well I think I might have some idea on how to make a move.'' Said Rias with a big smile on her face. The girls knew what that meant and some of them blush off.

''Oh really? Well I guess I might go as well.'' Said Akeno.

''Yes, if I had to lose some of my clothes I will do for Eren-san.'' Said Asia and some of the girls nod as well.

Soon the joy in the room died out. The felt a horror aura near them.

''Uh why do I feel a dark presence around us?" Asked Irina in fear.

''What did I tell you guys about striping near Eren?'' Asked a cold voice.

The girls turn around in fear, Mikasa had arrived home and she looked pissed.

''Hi Mikasa…you came home early.'' Said Asia in a bit of fear as Mikasa looked at them with a sword in her hands.

A few minutes later.

Eren came back to the dining room, however the only person present was Mikasa who was wearing a cute red dress.

''Uh where is everyone?"' Asked Eren

''They had to take a shower.'' Said Mikasa

''Really? All of them?'' Asked Eren a bit confused.

''Yes, it seems that they messed on something, and they need to have a shower quickly.'' Said Mikasa.

At one of the many rooms of the house

All the girls from the tables were all with some injury in their bodies. All tied and in a great amount of pain.

When it comes to spend time with Eren those girls were all in a civil war, and the biggest obstacles was always Mikasa and her tenacity of always beating everyone that tends to get nears him.

''Uuuuuuuuuuuh!'' Said all the girls injured and tied together.

''Let me guess, Mikasa?" Asked Armin opening the room door with a sweat drop.

Meanwhile

''Eren would like to taste my dinner? Its ok, its not hot.'' Said Mikasa a bit nervous

''Oh sure Mikasa.'' Said Eren eating with Mikasa making the girl blushes.

The teen just enjoy the food while Mikasa smile.

Yes, this is the type of joke we will see around. A yandere Mikasa versus most stereotypes of Harem girls. Plus is Devil Mikasa, try to beat that. Enjoy.