@HYBRID_BEING@Popinguj Is a pun make with the kanjis in japanese. In japanese red = Aka and to say that there is not a thing the word use is "nai = 無". So to say that there is no red rose it will be "Akanai" = 赤無い . Now the kanji for open 開 is also read and pronounce as "Aka" and to say "Don´t open" you say "Akanai = 開ない" ("nai" is also a way to negate in a sentence but it doesn't use the same kanji as before). So basically Nanako is traying to say him to "don't open" the thing. That's the explanation. I'm sorry for my broke english, is not my native language.