CREATE TABLE table_9573 ("Year" FLOAT, "Character" TEXT, "Title" TEXT, "Author" TEXT, "Artist" TEXT, "Imprint" TEXT)

what is the earliest year when the author is reki kawahara?
SELECT MIN("Year") FROM table_9573 WHERE "Author" = 'reki kawahara'
SELECT MIN("Year") FROM "table_9573" WHERE "Author" = 'reki kawahara'