Strange Daily Life with Travelers from Other Worlds

My name is Ye Qiu. I used to be just an ordinary person. Until my 16th birthday, everything started to change. To be precise, a person who shouldn't appear appears in my world. Since that day, my daily routine has changed so slightly that I didn't notice it at first. It was only later that I discovered that at that time I was already standing at the source of some kind of disaster.