greatly interesting

Short for 葦原の中つ国 (ashihara no nakatsukuni, “mortal realm”).

Middle-earth

a tale; a story

extraordinary, unusual

emergency

very; extremely / exceedingly; tremendously

a land, a large place / a country in general, a region / a country as in a nation, a state / the office of emperor, the crown; affairs of state / a province of ancient Japan

inside

中々: very, quite, considerably, rather, by no means (with negative verb)