Pledge
The weight of life on your sword is big when you pledge to protect your city. That's the big, big weight of every single person's life in that city pressing down on you every time you take out that sword.
Imagine holding up your sword and pledging to protect the lives of everyone in this city. It's a big deal!
けい
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Until the city is safe, you pledge to give up cake (けい), your favorite food.
Would you pledge to give up cake to show everyone how serious you are about protecting life?