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Artist's commentary
Touhou 4-Panel Strips #1993 Yukarin Goes to Comiket 1
It still hasn't been explicitly stated, but it'd be nice if they made it a proper rule.
[Survey: It's been hot for a while now, so what measures do you often take against the heat?]
β’ A/C
β’ Electric fan
β’ Cold baths
β’ Mentha oil
β’ Fighting spirit