Ghost virus.

Yana: What kind of virus? 

Joester: I won't worry about getting the virus out of you, and it's not deadly, it's just an excuse to go to the doctor. 

Yana: Okay, probably.

Yana goes to the hospital infected with the "virus" and goes to see a doctor. 

Doctor: How can I help you ? 

Yana: You can do a blood test for me ?

Doctor: Yes !

The doctor checks on her, after which Yana waits in the corridor to find Leo.

Leo enters the office of the doctor who did the analysis. 

Leo: What are you doing there ? 

Doctor:It's weird, her blood is a little different, as if it were a virus, I'm afraid it won't have a problem with an organ and require surgery. 

Leo: Oh !

Doctor: Please call the girl in the hallway.

Leo: Okay.

Leo walks down the hall. 

Leo: You're called to the hospital room. 

Yana: Oh, okay.

Yana enters the room. 

Doctor: It's nothing serious, just take these medicines and come on Monday, to have another blood test. 

Yana: Okay, Thanks.

Yana and Leo go out into the hallway and Yana tells him: 

Yana: Hey, what have you got to do with Unhappy Kid? 

Leo: What do you want to say ? 

Yana: Did you make a contract with Unhappy Kid? 

Leo: I do not know what are you talking about.

Yana: Tell the truth.

Leo in his mind: What the hell is going on, who is she?

Leo: Who are you ?

Yana: I'm Okabe Yana, a student at the ghost hunting academy, and I make a contract with The Ghost of Souls. 

Leo: Really ? 

Yana: Yes, my ghost destroyed almost all of Tokyo soon I'll have to stop it somehow. 

Leo: I see, my ghost has good intentions, he told me he was only interested in one person.

Yana: Okay, give me your phone number, in case something happens, if anything, we'll work together to stop it, because there's no one to help me with that......momentary.

Leo: Okay, here's my visit card, don't forget to come and do the second check in 2 days 

Yana: Okay.