Which Episodes have a TV Station of ntv, and a Japanese Title of あいのうた?
CREATE TABLE "2005_fall_season" (
  "japanese_title" text,
  "romaji_title" text,
  "tv_station" text,
  "episodes" real,
  "average_ratings" text
);
SELECT AVG("episodes") FROM "2005_fall_season" WHERE "tv_station"='ntv' AND "japanese_title"='あいのうた';