Disclaimer: Detective Conan belongs to Gosho Aoyama

So, all the action from fighting the BO ended, and Conan returned to being Shinichi. He never told Ran anything, not wanting to hear all her naggings and her emotions overflowing. Shiho Miyano was the new transfer student to Tantei High as Shinichi strongly requested.
Flashback:
Shinichi and Shiho were in Agasa's house. Walking towards Haibara's room, they thought of how impossible it was that Agasa was the boss the whole time. And it was the last the anyone can ever enter the place, it is going to be under investigation by the police.
"Okay, I'll attend school, on one condition. You must always protect me, from whatever," Shiho said jokingly with a smirk on her face.
"I will, even if you don't say so. Because I..."Shinichi was hesitant to say the last few words as her wasn't sure what he wanted to say.
Shiho raised a brow as a sign of interest.
"I owe it to you, I guess," Shinichi murmured to himself, buy still loud enough for Shiho's foxy ears to pick up.
"The antidote was this useful, huh? You forgave me from ruining your life, forcing you to live as Conan for such a long period of time."
"It doesn't matter, I'm back now. And I won't ever leave her side again. Ever." Shinichi mumbled under his breath, getting softer by each word.
"Now you are back, by her side, why do you still need me, here in Japan. I should leave, go somewhere else," Shiho said as she gently closed her eyes, breathing in a small amount of air, and opening her eyes again to face the detective that was so in love with his childhood friend, Ran-san.
"Where to?"
"Somewhere. Where no one recognises me. America? Canada? Just, just not here. "
"Why? You want me to protect you, right. Then why do you want to be somewhere where I can't reach you."
Shiho swallowed. "Because I hate you. I can't stand seeing you happy. I hate it." Her voice, suddenly so weak, like it was going to disappear soon. She didn't look Shinichi in the eye. Instead, her head was hanging low, and her bangs were covering her eyes, making one unable to guess what she was thinking. But inside, she was shaking.
Shinichi smiled faintly at her. "You hate me that much? I guessed it can't be helped. But, I'll still protect you. So, come to school with me. Together we'll lead a normal life. Like any other. Isn't that what you want? Let's fulfil it together. Please?" Shinichi voiced out as he slowly approached Shiho, taking her hand in his. "I'll protect you, with all my life. Forever. I promise you."
Shiho lifted up her head to look at Shinichi. Shinichi had that look of a kid that was afraid to lose something important. But somehow, Shiho managed to convince herself it was just her imagination. She nodded to give her affirmation to Shinichi.
Flashback ends.
"Alright class. Settle down. Today we will have a new student. So give her you best impression," the teacher of class 2B said with a monotonous pitch.
The class was filled with chatters and murmurs as they discuss about the newly transferred student.
"Shinichi! I heard that the new student is a girl!" Ran exclaimed with delight. "I hope we'll be good friends!"
Shinichi forced a smile as he knew that it was almost near impossible.
Shiho walked into the class. She was absolutely stunning. Her face was like a light source, blinding every single student except for Shinichi. Well, only because he had already adjusted to that heavenly looks that were out of this world. Although this was the case, Shiho was accompanied by an aura. It was shielding her from any form of contact with others. It was cold and deadly.
"I'm Shiho." That was all Shiho had said, sweet and clearcut. She ignored all whistles that were directed at her and pleas that were practically begging for her to sit beside them as she strided to the seat at the back, where no one was seated at. When she passed Shinichi, he gave out a smug look, thinking that it was absolute that she would sit beside her like how she did back in Teitan Elementary School. But no, she didn't. Instead, she walked passed him. Unexpected, he glanced at her while she took a seat that was isolated from everyone.
"Miyano-san, you can sit with a student, so that they can help you with your students. What about..." she paused as she scanned the classroom for a suitable candidate. "Kudo-kun? He's the smarter in our class. He will be able to help you."
"No," Shiho answered without looking up at the teacher. The teacher shrugged it off and begun the lesson. Shinichi smiled as he already knew her reaction.
So the lesson begun.
After school:
"Shinichi! Let's go home together," Ran shrieked as she grabbed Shinichi's hand, so tightly he couldn't shrug it off.
"Hey Shiho, let's go."Shinichi waved to Shiho as she was packing her bag, ready to leave.
Shiho took at glimpse at Shinichi's childhood friend to see if she was willing to let her beloved leave with another girl.
"Shinichi? You know her?"Ran questioned with a slightly irritated face, as she grasped onto Shinichi's arm even tighter.
"We're kind of acquainted, you see," Shinichi answered with a silly grin on his face as he pivoted his head to the direction of Shiho. "Right?"
"How so?" Ran getting more and more suspicious of their unusual relationship.