The two girls are fine and have found a way to work together to combat the Ninja. They will scream at him first if he comes anywhere near them and he would stop and skulk away. If that doesn't work, the would go towards him menacingly and growl. Usually that is quite enough to scare him a bit and he would leave them in peace.
The boys have it much worse. They have not figured out what to do. Bujang of course thinks he is young and will learn and so have not been very fierce with him although he admits that he is 'not as patient as before' and Tanaka has decided to keep himself away as much as he can from the Ninja. This of cos has resulted in Rezki being lonely and he goes around meowing mournfully. But the boys know this is a ploy to get them out so he could chase them with his fur and tail bristling.