Which event was in Tokyo, Japan and had an opponent of rumina sato?
CREATE TABLE "mixed_martial_arts_record" (
  "res" text,
  "record" text,
  "opponent" text,
  "method" text,
  "event" text,
  "round" text,
  "time" text,
  "location" text
);
SELECT "event" FROM "mixed_martial_arts_record" WHERE "location"='tokyo, japan' AND "opponent"='rumina sato';