Responses
No. 2 doesn't. No 1 does. Remember Ikeda had 3 sons? The eldest is abroad, the youngest is Sakae from ch. 4, the second is Toshiki, he's from ch. 1.
But you know what, I bet the certain big company HQ the stepmom from ch. 2 was holding protest off is Ikeda's company. That would be a laugh. (≧∀≦)
Are Chapter 1 and 2 also interconnected to Chapter 5? If so, please explain cause I think I missed it lol