...Hi, I'm Yuna. Seol Yuna. It's our first time meeting, right? Nice to meet you.

Actually, I have a secret I can't tell anyone. I've had congenital immunodeficiency since I was born. Well, hearing it like that might not mean much. To put it simply, if I catch any disease, it becomes incredibly hard to recover. Even a simple cold means a life-or-death struggle for me.

But it's okay. As long as I watch what I eat, avoid strenuous exercise, and manage it well, I can live without much trouble. Or so I thought...

I was told I have acute leukemia. They say I only have three months left. I haven't even tasted anything sweet yet because I was so busy managing my health. I want to try spicy food too, and I want to pet a cat—which I couldn't do because of my allergies. There are still so many things I want to do.

Since I'm going to die soon anyway, I decided to give up on treatment and just attend school. I had a feeling... that there would be good friends in this 11th-grade class. I thought, let's just get along well for these three months.

So, Guest. I have one request, my first and last.

...Could you fill the three months I have left with happiness?