How did you find out my birthday?

I must admit that Kutsuji's offer is very enticing. He also hit the nail of the issue on the head, so I nod in agreement after thinking for a moment. [Kutsuji]Oh? I haven't even told you what I want you to do yet. Don't you think you're agreeing too quickly? [player]Hmm? Did you want me to reject your offer? [Kutsuji]No, I'm just curious. Hasn't the thought that I might ask you to do something immoral, unethical, or illegal crossed your mind? [player]Oh right... Kutsuji's words are a reminder to me. Judging from our brief interaction, it's quite likely he might make such a request. [player]You guys haven't always been doing immoral, unethical, or illegal things... right? [Kutsuji]Are you trying to find out information about Strix? I'll need to charge you extra for that. There's no way I will pay for that. Every copper I make as a Jyanshi must be used to make myself improve at the dojo. I pretend to zip up my mouth with my hand and don't ask any other questions. [Kutsuji]Haha, you're an interesting person, and you even seem quite gullible. [player]Um... Were you lying to me when you said you would give me the information I need? [Kutsuji]No. I keep my word most of the time. He taps the desk with his fingers as he speaks. Soon after, a person walks over from behind me. It is the girl who opened the door for me the other day. She hands me a very valuable-looking black bank card. [Kutsuji]Take the funds you need for the task first. [player]What funds? [Kutsuji]Countless Springs holds an auction for cut flowers every month. They are auctioning off cut flowers on the surface, but the real thing that is being sold is the opportunity to have afternoon tea with the geisha behind each cut flower. [Kutsuji]They are all beauties who people would spend a fortune to meet. Even Kurone Toujou takes part in this auction occasionally. All you have to do is get her flower and this opportunity. [player]Which flower should I get? [Kutsuji]I don't know. [player]Huh? [Kutsuji]This event has always been carried out in the form of a mystery draw. Every time it is held, each geisha picks their flower at the last minute based on their mood, so... you'll need to do your best. A mystery draw... Those are bad in every circle! I recommend that all consumers boycott this practice! [player]Isn't this pretty much a test of luck? Can't your intelligence network find a way to find out in advance? [Kutsuji]We might be able to if it was anyone else but Kurone Toujou because only she knows which flower she will pick. She won't even tell the attendants closest to her. [Kutsuji]All we know right now is that she will participate in tomorrow's auction. [player]I thought people say there isn't any news you can't find out. [Kutsuji]That's right. See? The mission you're about to do for us is to check out the news, right? [player]I understand. So I need to attend this auction and win the bid for Kurone Toujou's flower, right? [Kutsuji]To be precise, you need to attend the auction, win the bid for Kurone Toujou's flower, and meet her as the buyer. [Kutsuji]After that, you will return here and tell me everything you saw and heard during this time. [player]I have a question...