Executioner if you fail Kyou well I know is kind of unreasonable.
He know how to cultivate monster but that doesn't mean he is expert and he forced to take request, more like an order.
"The time my sister has is minute..." sounds really strange to me. Is this a legit phrase? (I'am not a native english speaker, pls don't bite my head off.)
It also hit me as being a really awkward way of phrasing that sentence. It's technically correct, but saying something like "The time my sister has left is (extremely) limited" "My sister doesn't have much time left" or even the more archaic "She is not long for this world" would have been better.