Take a sip every time:
- Decim explains the rules to newcomers.
- Said newcomers try to find the exit and fail.
- Onna/Black Haired Girl is enraged by Decim's behaviour.
- Decim is attacked, either by the newcomers or by Onna.
- The newcomers have a sudden and shocking flashback.
- One of the newcomers says something along the lines of, "We're dead, aren't we?"
- Every time Chavvot is mentioned in any way, shape, or form.
Two sips every time:
- Memine appears (not including the part where she's briefly seen in the OP).
- Decim tries his hand at humor or giving compliments.
- Something sad happens.