宰 means “preside, administer”

さい · sai

Also: superintend, manager, rule

On'yomi (Chinese reading)
サイ

JLPT N1 · Taught in secondary school · 10 strokes

The story

A roof (宀) over a sharp blade (辛): picture the steward who runs a great house and carves at its feasts. 宰 is presiding: 宰相 is a prime minister, 主宰 the leader of a theater troupe, and the novelist 太宰治 wore it in his pen name.

Used in 宰相 (saishou, prime minister) and 主宰 (shusai, presiding/leading)

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Readings from KANJIDIC2, © EDRDG, CC BY-SA.