quot;Boin" (ボイン)is slang for boobies (or a busty woman) in Japanese. So the package says it
I am a boob? - WaniKani - WaniKani Community
BOOBY definition and meaning
BOOBY definition in American English
BOOBY English meaning - Cambridge Dictionary
Booby Definition & Meaning - Merriam-Webster
Boobie curry! Boin (ボイン)is slang for boobies (or a busty
booby, meaning of booby in Longman Dictionary of Contemporary English
BOOBY definition and meaning
BOOBY definition and meaning
BOOBY definition in American English
BOOBY definition and meaning