Mikasa Ackerman walked to Connie Springer's closet. Only to find that there was no one there.
The entire hallway was filled with students walking to their classrooms, chatting, or minding their own business. As for Connie, he was nowhere in sight. Mikasa stood near Connie's locker. She laid her back against the wall and waited with her hands crossed.

Connie arrived exactly a minute later. He arrived with his backpack that seemed to be containing nothing due to the way the bald boy held it with one arm and not on his back.
Connie then opened his locker and started taking everything and putting it inside the backpack.
He failed to notice that his accomplice was standing next to him and that she didn't even utter a single word and just stared at him.

"Done?" Mikasa then said. Connie jolted back and stared at Mikasa in shock.

"How long have you been there?" He asked.

"Only about a minute or so. I'm surprised you failed to notice me." She replied.

"I'm sorry, I... I didn't get too much sleep yesterday." Connie explained.

"Why?" Mikasa asked.

"Hehe... well I, uh... t-too much gaming, I guess... hehehe!" He said nervously. "Yea... that's what happened."

"Okay." Mikasa replied casually even though she already noticed that he was not telling the truth.

"Well, see you back at my place after class!" Connie said as he walked away to his classroom.
Shortly after, Mikasa did the same.
She walked Away.
But not to her classroom. Instead she headed to the bathroom.
Inside she looked at herself in the mirror.
Then she decided to wash her hands. After doing so, she looked at her reflection in the mirror.
To her horror. Her reflection wasn't looking back.
Instead Mikasa only saw the back of her own reflection. Her mirror self was looking away.

Slowly the reflection started to turn towards Mikasa to face her.
The reflection's eyes were a light shade of red and blood had dripped from the right side of her mouth like saliva.
The reflection's left eye was dripping a single tear of blood. Yet her ghostly gray face was emotionless.

"You cannot maintain your sanity forever, Ackerman." The ghostly reflection said from the mirror. "No matter how hard you seek, how hard it will take you. No matter how much pain and suffering you endure. You will change nothing. You will never find him. You will never find peace and redemption."

Mikasa stared back at her dark reflection. And said:"True. I may suffer. I may pay the price of my own well-being in the process. But I will endure. And I will tell Eren how I truly feel!"

"Only Death Awaits You At The End Of Your Journey"

"I am what fate has made me!"

Mikasa then punches through the mirror, breaking it.
The ghostly figure disappeared and Mikasa was left to reflect on her mistakes.

"Eren... I need you..." She cried, laying her head in her crossed arms while sitting on the ground, her back towards the wall.
"I cannot do this alone..."

"You're certainly going to end up hurting many." A familiar voice said.

Mikasa looked up only to see that Annie Leonhardt stared back at her with cold, dead eyes.
Mikasa got up and walked towards the door.

"Out of my way." She said.

Annie then blocked Mikasa's way by putting her arm in front of her rival.
"Your mental health will only end you up in an asylum. The place where you belong."

Mikasa grabbed Annie by her throat.
"I warned you! Out of my way!"

Annie then punched Mikasa in her stomach. A punch so strong it sent Mikasa hurling backwards towards the floor.

"You think you can just do whatever you want?! Eren isn't yours anymore! Forget about him!" Annie yelled.

Mikasa slowly got up with her rage building up faster than she could run.
"You take back every word you said, right this instant." She threatened.

"Or what?"

Before she could know it, Leonhardt was sent flying through the air by a punch so strong, it would break a normal person's jaw.
She slowly got back up and readied herself for a fight of a lifetime.

"Oh, I've been waiting for this!" Annie said. "Show me what you got!"

Another punch to her stomach sent her flying up in the air. Mikasa then jumped and smashed her down with two slams on her back and set her crashing to the ground.

Mikasa then stopped and picked Annie up.
"Had enough?"

"Oh actually, quite the contrary, sweetheart! Now it's my turn."

With one punch, she sent Mikasa flying back towards the bathroom.
Annie casually walked towards the bathroom, but to her surprise, she did not spot Mikasa anywhere. She walked further in, only to see that Mikasa wasn't there.
Just as she was getting out of the bathroom, she felt a pair of hands squeeze her by the neck and then spin her towards her back.
There, Mikasa started punching her in every conceivable way imaginable. She was hiding in one of the stalls.
After finishing her series of punches, she Spartan-Kicked her to the ground. Then she proceeded to get down on her and start to choke her.

At that point, no student was at the hallways so no one was there to watch or intervene. Though Connie was aware of what was happening as he hijacked the security cams and replaced the feed and footage in the surveillance room with ones of empty hallways.

Mikasa was choking with her left hand and punching with her right.
She was punching so hard she could not feel her own hand.
She paused for a second to take a quick breath, only for Annie to kick her opponent off her and send her flying away with another kick.

She lifted Mikasa like a battering ram and ran her straight towards the wall where she started to deliver a series of punches of her own.

Mikasa managed to dodge one punch and then took that golden opportunity to punch Annie out of her hold. She then grabbed her and choked her to the point where she was knocked out.
Mikasa then placed Annie inside one of the bathroom stalls and headed outside the entire school and then headed home.

Later in the day, Connie headed to his house and called Mikasa. Mikasa said she'd head to his house in a few minutes, but showed up late.

Connie opened the door only to find her standing in front of him, carrying a backpack.

"Kept you waiting, huh?" Mikasa asked.

"Yea. Now come on inside."

Mikasa and Connie sat in the living room. He opened his notebooks and books and searched for clues while Mikasa pulled out her laptop and started doing her homework.

While reading through one of his notebooks, Connie stumbled upon a page written entirely in red. He knew it was not him who wrote it, so he started to read. He noticed that the handwriting did not match his own.

'Connie. This is Eren. Send the following text:
'WOF.' To the following number:
(XXX-XXX-XXXX)
Then follow the coordinates to the location the number sends. There you will find M'

"Mikasa! Come read this!"

"Huh?"

Connie gives the notebook to Mikasa and tells her to read the note. Then he proceeds to send the message to the number in the letter.
A few seconds later he gets a message with the coordinates to a restaurant.

"That place is fairly close by. We should head there." Mikasa said as she got up and grabbed Connie by his arm.

"Wait, now?" Connie asked.

"Uh Yea!"

"But I didn't even get to change my clothes!"

"Well I took a bath and prepared. Why didn't you?"

"I was... doing some stuff. Some... important stuff..."

"Yea right. Well c'mon!" Mikasa said as she pulled Connie's arm.

"Y'yargh! Okay okay! You nearly ripped my arm off!"

Mikasa and Connie then headed off to the restaurant.

Message the number.

You'll get a hint of what's to come next