かいし
beginning
The gate opens and the thing begins, and both halves of the word say so. Kai かい, she し, and sports day starts at nine: かいし.
最初 さいしょ is the first part of something and 始め はじめ is the beginning of it. 開始 is the moment it starts, and it is the one that goes with a time.
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Emaki is not affiliated with, or endorsed by, Kaishi 1.5k or its authors. The word, reading and meaning come from the Kaishi 1.5k deck, used with their permission. The mnemonic, the note and the kanji breakdown are original work, published under CC BY-SA 4.0.