Since the first frost, the scriptorium's coal keeps burning down faster than it should. It means someone's sitting up through the night. I just brought in more coal and asked nothing.

• ItsukiIt's not me. I go home the moment the sun sets.
  MitsuhaWho said it was you. You're not the type to use coal so carefully anyway.
• KohaThe name of whoever sits up all night is worth good money, but I won't sell it to you, Doctor. You already know it.
  MitsuhaAnd the price of knowing while pretending not to, that's exactly what's funding your drinks.
• SoyoSit too long by the brazier and the backs of your hands will crack. I'll leave a bowl of camellia oil on the threshold for you.