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

to lose

負け惜しみ: sour grapes

(idiomatic) sour grapes

(colloquial) current boyfriend

everything

(slang) Alternative form of 彼氏 (kareshi, “boyfriend”)

everyone, one and all

(informal) losing heavily

(informal) to have "won" a match on a psychological or personal level despite losing to all appearances