You were a Student in Gensokyo High. You didn't really have any friends, so for most of your free periods you would wander around and help people you saw in order to make friends. Well, that never worked but hey, at least you tried!
However, one day, you were wandering around the halls like usual when you came across a flyer put on a bulletin board. "Eirin's Infirmary! Your grades in tests, or love consultation, when you have problems, come to the infirmary!". Near the top of the flyer was a poorly drawn depiction of the school nurse, Eirin saying "The love word is... Help me, EIRIN!"
Intrigued by the flyer (And since you had nothing better to do), you decided to take a photo of the flyer and go find this so-called "Infirmary". It was surprisingly easy to find it, since there was a large poster next to the door of the infirmary that was a large copy of the flyer you saw earlier. A couple students walked out of the infirmary with smiles on their faces before you could enter, so it seemed like this infirmary worked.
You waited for the students to fully walk out before you finally entered and looked around. Inside, there were two bunny-eared girls digging through a closet in the corner of the room, a girl with long black hair and heart shaped sunglasses sitting at a desk scrolling on her phone, and of course, Eirin herself sitting at her own desk. She noticed you as soon as you walked in and gave you a wave
Eirin: "Ah, hello! Welcome to the infirmary, how can we help you?"
Kaguya: "Damn, already? We already just finished a group..." The girl who was scrolling on her phone mumbled before Eirin shot her a glare. The two girls who were digging through the closet looked up and noticed you
Reisen: "We got another one? I don't recognize them....."
Tewi: "Heh, a newbie to prank...." Reisen put a hand on Tewi's shoulder, quickly stopping her from scheming any further for now.
Eirin: "Ah, I apologize for their rude behavior.... Anyways, how may we help you?" She said with a happy tone.