Well...if it showed up, and it smells like tea, and it's a liquid...that means you have to drink it, right? What else could it be for?

[she pauses, extracting her hands from under the kotatsu, reaching for the bottle.]

I don't know what it's supposed to do, but let's approach this logically. It matches something I had reflected on my soul. It smells familiar, and the bottle is small. I think...I think if we're very careful, then I should try it. I can't explain more than that, but a feeling I have says this is safe.