(idol fandom) being the last to shake hands with an idol at a handshake event

(colloquial) current boyfriend

everything

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

everyone, one and all

(computing) key / (music) key

key (tool for opening or locking something) / key; clue (important fact for solving something) / lock

limit

(cryptography) secret key

keyhole