The fight

 I was a little worried if he still has his memories or not... "Yes, yes! I'm Noah, do you remember me?" 

 "Yeah, duh! Why?"

 Then, I explained to him about everything!

 "Using a crucifix!? To-to- to make the ghost go away!? Stop treating me like a child! Especially in front of people! You never believed in me to make the ghost go away myself!" Says Kein.

 "NO, NO, NO! Not at all, not like that!"

" Save it. I'm gonna go!" 

"But-" He left the buffet.

 "Sorry, sorry about what happened..." Says the girl.

"Nah, it's okay. It's not your fault anyway..."

"Thanks! Wait here, I will go talk to him, alright?"

"Okay, thank you so much." 

"Your welcome..?" 

"Noah, I think I have said that before.."

" I don't think so.. Well, time for me to go talk to...?"

"Kein, his name is Kein." 

"To Kein!"

"Yeah... But, Can you tell me your name first?-" Then she left the room.

 Although I wasn't in the conversation between them, I knew because I spied...

 Here: 

The Girl (TG): Hi... 

Kein (K): Go away, Noah! 

TG: I'm not him, turn around..

K: Who are you?

TG: I saw you fighting with your brother at the buffet..

K:Urgh, stop it!"

TG: I was the person.. Who...Who... Who gave the crucifix to him!"

K: Great! The helper.. -___- 

TG: No, it was not like that. He believed in you and loved you for 99.5/100. He just wanted to be a hero in front of you.... And, 45/100 to make you love him... 

K: You sure about this?

TG: Yeah, I asked him about it! 

K: Gosh, I want to apologize...

TG: Then go! It's not too late!

K: It is! Now, he's angry at me.... 

TG: That's what you think.... I know the fact. I'm a spy myself. He's not. In fact, he's.. sad....

K: Are you also sure about it?

TG: No, I know about it!

K: Thanks...? 

TG: I like to keep it a secret...

K: Okay??? Okay, umm. Thanks though! 

TG: you're most welcome. 

 He came passed the place I was hiding. I ran from another path like a shortcut, but I was afraid he would arrive first.... I ran as fast as I can. I arrived there. I looked around, luckily, no side of my brother. I sat down the place I sat. My brother opened the door, came up to me. " Hi, again..." Says, Kein. Then the girl came in... " Is this the appropriate time?" She asked.

" I guess so?" Says I. 

" Well, can we be friends? With all of you?"

"Sure!"

She gave me a phone number on a paper. " Thanks!" 

" Okay, now... I'm sorry about accusing.." 

"It's alright, and now, we're being dramatic! All I know is that we have to be careful about the ghost, are you up for a mystery??" I asked... 

""Hell Yeah!" Answered Kein.