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At what point in these 30 chapters led any of you to believe Hilise gives a rat's ass about a silly little cup going missing???? ┑( ̄Д  ̄)┍
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Tradition for centuries… she need to use that during the official ceremonies where all the nobles will be attending including the head of the main houses.
It’s the ceremonies to officially announcing that she has became the head.
If she don’t have that, some family may purposely cause rumours or whatever that could threaten MC’s position…
Well, treat the holy grail as a very useful politic item the MC need.
Now the comments have come back, needed to gush about how much I love this manga, and Kan-chan and how much the story helps me self-soothe when I'm going through a bad time. It's so damn good.