きゃいけない
nakyaikenai

Expression

1. cannot do without something; indispensable; absolutely necessary

Usually Written in Kana
Related to 無くてはいけない【なくてはいけない・1】
Expression

2. have to do

Usually Written in Kana
Related to 無くてはいけない【なくてはいけない・2】
すぐに手紙 てがみをかかなきゃいけないよ。
suguni tegamio kakanakya ikenaiyo.
You've got to write to him quickly.