How many rounds have an Opponent of sakae kasuya?
CREATE TABLE table_57681 (
    "Res." text,
    "Record" text,
    "Opponent" text,
    "Method" text,
    "Event" text,
    "Round" real,
    "Time" text
)
SELECT COUNT("Round") FROM table_57681 WHERE "Opponent" = 'sakae kasuya'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: How many rounds have an Opponent of sakae kasuya? ### Input: CREATE TABLE table_57681 (
    "Res." text,
    "Record" text,
    "Opponent" text,
    "Method" text,
    "Event" text,
    "Round" real,
    "Time" text
) ### Response: SELECT COUNT("Round") FROM table_57681 WHERE "Opponent" = 'sakae kasuya'