Ch. 1 and Ch. 0 are the same chapter just one has a color page. So disappointing. Wish I could translate the Chinese raw of the real Chapter 2. T^T All I can guess is the raw ch. 2 is a back story of how the twins in their youthful innocent teenage years began to have strange felling for Keiichi. Well I think.
Futari No Musuko Ni Nerawarete Imasu