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Repose Of Souls
noun, する verb
To tranquilize souls you have to a have a mass repose of souls. Then their souls will move on to the next life and stop hanging around here, haunting umbrellas.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
Tanabata is a ritual to pray for peace and give repose to people killed in the war.