You read it from right to left.
Summary of chapter 1: Miki is kissed by Kashiwa (older) and the two were spotted by chiaki teru. Chiaki teru was looking for kashiwa (older) to ask about his brother kashiwa (younger). Kashiwa (younger) is friends with chiaki teru. He recently got a gf and has been negligent of chiaki teru and friends. Miki and Chiaki meet at this abandoned building and fight. Each has their own angst and they recognize it, that's the start of their relationship.
I do hope you give this manga a chance, I was like you, I had trouble understanding this manga. But now that I've came back, I just absolutely love it. It's topped my list for best manga all time. The characterization is phenomenal and I absolutely adore every character here.
Can someone just explain like the first chapter for me, maybe that might be too much to ask but I felt like it wall all over the place. IT IS INTERESTING (๑•ㅂ•)و✧ I just have questions about the way it is written I guess, but anyways I’ll keep on reading to understand the idea at least. (￣∇￣")