CREATE TABLE table_64495 ("Japanese Title" TEXT, "Romaji Title" TEXT, "TV Station" TEXT, "Episodes" FLOAT, "Average Ratings" TEXT)

what is the most episodes when the average ratings is 18.8%?
SELECT MAX("Episodes") FROM table_64495 WHERE "Average Ratings" = '18.8%'
SELECT MAX("Episodes") FROM "table_64495" WHERE "Average Ratings" = '18.8%'