未開発: being undeveloped

未然形: a Japanese verbal inflectional category: the irrealis form

千早人: allusion to 宇治 (Uji, “a placename, especially of a river crossing”)

those who know, know

a middleman, broker

(mahjong) hand of man: win by discard on the first go-around of play; depending on the rules, it can be worth 役満 (yakuman, “limit”), 倍満 (baiman), 満貫 (mangan), or any other number of points

harmony among people

runaway (person)

(science fiction) subterranean dweller/inhabitant; person who lives underground

(science fiction) time traveller