Update!!!
Jun's past is revealed. Not all just a little bit..

And there will be confessions..
Here you go!!
After school..
Jun and Mayu had finished their punishment. It took a whole school day to finish it. This school really had a lot of toilets.
"Oi Jun... Do you think they still angry?" Mayu suddenly asked then sipping his cola.
"I think yes.. I bet Rena chan won't talk to me today." Jun answered while drank his cola too.
"What must we do? I never can stand it when Yuki mad at me." Mayu really looked down since Jun met him again.
"Cheer up Mayu! Just say sorry and promise you will never do that again." Jun gave suggestion.
"I have done that before."
"And now you still doing this again? No doubt she is really angry right now." Jun smirked.
"You're not helping Jun." Mayu hit Jun's arm.
"Ouch.. Sorry... But i have my own problem too." Jun said and rubbed his arm.
"I'll go home first Jun. I'll go to Yukirin's house tonight." Mayu said.
"Good luck buddy.. I hope Rena chan not angry anymore."
The two of them walked separately. Jun went to teachers' room to find Rena while Mayu walked to the school gate and went home.
Jun walked to teachers' room to find Rena. He thought maybe Rena had cooled down a little now.
He opened the door and found Rena was sitting doing her works. She didn't notice Jun came to her direction.
"Rena." Jun called her.
"Oh my god Jun. you startled me. What do you want?" Rena said still a little bit cold but not that scary as before.
"Nothing.. I just want to go home with you. Hmm... And i'm sorry for today." Jun rubbed his nape not looking at Rena.
Rena stopped her works and looked at Jun.
"It's okay. Just promise me you will never do that again." Rena lectured Jun.
"Okay i'm promise. You're not angry anymore right?"
Rena shook her head. "But if you do that again i won't talk to you ever again."
"No! Don't do that!" Jun panicked.
Rena laughed. "Actually when i was student back then sometimes i skip classes too. But if i think again now it really useless."
"You skipped classes too? Wow i never imagine it before.. You look like a role model student."
"Oh shut up.. I was just an ordinary student. Anyway.. Why did you skip class today?" Rena asked curious.
Jun shocked heard the question. "Hmm nothing.. I was just bored. That's all."
"Really? I don't think that just the only reason. Your face said other things." Rena interrogated Jun.
"Really nothing.." Jun still didn't want to say the truth.
"Oh come on Jun. Did you miss me so much so you went to peek from my class's window?" Rena teased.
"Wha!! No!" Jun blushed.
"Hahahahaha.. You are blushing! Am i guessing right?" Rena amused.
"Stop it.. I just want to know how you teach. You really scary.."
"If you tease me i mad again then." Rena pretended she was angry.
"Sorry.." Jun gave her his puppy eyes again. He really know how to lure Rena. "Ugh i hate that eyes."
"Hehehe you still can't resist my cuteness. Let's go home.."
"Okay okay.. Let me tidy up my desk first."
"Let's go now?" Rena said.
"Un"
Today's walk seemed really quick. They didn't realize they had already arrived at their home. But...
"Who are those men in front of my house?" Rena talked again after the long silence.
Jun looked at the men. They saw Jun too and ran after Jun and Rena as soon as they saw him.
Jun pulled Rena and ran away from the men.
"Waa... What's wrong Jun?" Rena asked while being dragged.
"I will explain to you when we are away from them."
It's not easy to run away from trained men. They are fast and not easy to lose. There are some times Jun and Rena were about to get caught but fortunately they still could manage to escape.
Finally after a long journey of running Jun and Rena could get away from those misterious men. They walked to get some air after the tiring escape.
No one talked when they were walking. Rena was afraid to start asking so she waited for Jun to talked. After few minutes of walking they finally stopped at the nearby park. Jun still kept silent and calmed himself down.
"I need to tell you something.." Suddenly Jun started talking. "I'm sorry i dragged you to my problems."
"Who are they Jun? Why are they casing after you?" Rena asked hesitately. "And.. Who are you?"
"Okay first.. Do you know Matsui clan?"
"If i'm not wrong.. That's the most feared yakuza family right? They are pretty famous around here.."
"Yes you're right, and that's me. My dad was the leader.."
"What?!" Rena shocked.
"He was.. Until he..." Jun's voice was decreasing till he stopped and looked really sad.
"He what?" Rena asked full concern.
"...he was killed."
Rena shocked hearing what Jun had told her.
"At first i thought he had heart attack. Everyone think so but in the end i found out that's not the case. My father's friend... He is the killer. He made it like he had a heart attack. And now when he know i have found out he chase me down to take my life. He's already like my uncle though."
"He want to do that so he can take over the clan?"
"Yes you're right.."
"This is too complicated..."
"I'm sorry Rena san. I don't want to drag you to my problem but.."
"What's wrong Jun?"
"I like you.. I can't let you go.. I feel like i forget all my problems when i'm with you. Everytime i wanted to go in the end i always came back to you.. Sorry.." Jun looked away.
Rena blushed madly hearing Jun's confession. She couldn't said anything so she just waited Jun to continue.
"I like you since the first time i saw you. I went to your school everyday because i want to see you."
"I never knew it.. You stalked me??" Rena asked.
"Of course no!!" Jun replied panic looking at Rena. "Ehmm.. Okay yes i stalked you.. Sorry.."
"It's okay.. I don't mind as long as you don't bother me."
"I never thought you would find me in that empty street. That place is kind of... creepy. When i heard footsteps i thought i would die soon."
"But that footsteps is mine.."
"Yeah... At first i didn't want to bother you but after you talked to me for the first time i lost my mind and i couldn't just let my chance to be near you go no matter what."
Rena just kept quiet didn't say anything.
"I'm sorry.. Because of my ego i drag you to danger." Jun just looked down. "I should have let you go that day. I will go from your house today and i won't bother you anymore.. Thank you for everything." Jun bowed and walked away.
But before he left suddenly he felt weight on his shoulders.
"Wait.. You know i never take back my words. You will stay at my house. I don't mind helping you. I helped you that day so i won't stop just because i know who you are.." Rena closed her gap with Jun and then hug him. "Just tell me anytime when you need my help okay? Never think i won't help you.."
Jun nodded his head. "Thank you.. Rena chan..."
That night Mayu went to Yuki's house. He rang the bell. Not long after that Yuki opened the door. As soon as she saw Mayu she closed the door again.
"Yukirin! Wait! I need to talk." Mayu banged the door.
"What else do you want to say Mayu?" Yuki said from behind the door.
"I'm sorry. Please.." Mayu said still banging the door.
"Stop it already Mayu! I'm tired! Go home!" Yuki said coldy.
"I know i already promised you.. Please give me a chance. I won't make troubles again."
"How can i believe you Mayu? You said this last time but see what you did today." Yuki still answered coldly.
Mayu started to get teary. "Please don't be mad at me like this."
Heard Mayu crying Yuki couldn't help herself she opened the door and let Mayu went in.
Yuki sighed then patted Mayu's head gently. "Stop crying okay? You are still a crybaby although in school you are such a troublemaker." Yuki giggled.
"Shut up!" Mayu said embarassed still crying a little.
"I'm sorry Yuki i didn't mean to disappoint you." Mayu said after he was a little bit calmer.
"Why do you always like to make troubles Mayu? You are not like this before."
Mayu diverted his eyes from Yuki. Then he started to talk again still not looking at Yuki.
"When you went to university we rarely met and slowly when i realize we are not as close as we were before. So when you graduated and decided to move to Tokyo i said i would come with you. I thought i could get closer to you. But.. When school started i realize it's useless. You always distracted by other things. And then i think if i make troubles you will see me for sure..." Mayu looked at Yuki. "I just want you care for me like when we were kids Yuki! Why can't you understand that?" Mayu said half shouted.
Yuki surprised by what Mayu just said. She never thought all of this. She never understand why Mayu became like this before.
"I'm sorry Mayu. I never think how you feel." Yuki hugged Mayu tightly.
"I like you Yuki. Ever since we were just a kid, i like you. I always like you." Mayu confessed still hugging Yuki.
"You know what? The reason why i make gap between us is because i like you too Mayu. But I'm scared if we still as close as we were in the past i will fall for you harder." Yuki admitted.
"Why must you scared?" Mayu asked.
"Our age gap is too far Mayu. People won't accept us. And now i'm your teacher. It's impossible." Yuki explained.
"I don't care what others say as long as i'm with you. We won't in trouble if no one know about us."
"But..." Before Yuki could finish talking Mayu kissed Yuki. At first Yuki resisted but in the end she kissed Mayu too. After the two of them ran out of air they stopped still hugged each other.
"Please believe me. I won't let you in trouble. Do you want to be my girlfriend Yuki?"
"Okay.. But no lovey dovey at school." Yuki smiled and kissed Mayu again.