Vocabulary consisting only from characters you are able to read
いつの間にか
いつのまにか
before one knows, before one becomes aware of, unnoticed, unawaresjlpt3
地下道
ちかどう
subterranean tunnelmix
口語
こうご
(1)spoken language, (2)literary style based on (modern) spoken language bunpou
一年後
いちねんご
za rok, po jednom rocetoki