a prefecture in the 中国 (Chūgoku) region of Japan facing the Seto Inland Sea; its capital city is also 岡山 (Okayama)

kayakujutsu

(idiomatic) being excluded; being ignored; being kept in the dark (about); being kept out of the loop

gayageum

An izakaya: a Japanese bar or pub that serves alcoholic beverages and also sells snacks; a type of Japanese drinking establishment which also serves food to accompany the drinks. They are popular, casual places for after-work drinking.

行っていらっしゃい: alternative form of いってらっしゃい (itterasshai)

see you later (said by a person staying, a stock phrase required by the Japanese etiquette, lit.: (after) going, come back)

(humble) alternative form of いってきます (itte kimasu)

back and forth

(colloquial) Synonym of 行って来ます (itte kimasu, “see you later”)