@@memixHONMONO This is because Koreans are well aware that the Korean word '니가' (in English, you are) sounds the same as the discriminatory word for black people called 'Ni**a' :) (This answer was written using a translator.)
It’s funny because in the song, in the parts where they say Nika or Bonika, it sounds like Neega. Nega is supposed to be a dergitive of love you or I love you in Korean, like Sarhange or sarhangeyo.
Noa「ahh...sensei♡」 sensei「Mmm hehehe(Roar of the Beast)」 Alice「!」 Momoi「Lustful dreams are embarrassing!!」 ↑This is a Japanese Blue Archive meme. (キヴォトスでは淫夢は恥ずかしいんだよ!) ━━━━━━━━━━━━━━━