Talk:Pre-Series Timeline/@comment-26229461-20150809095710/@comment-17259909-20150810201916

Indeed.

Edit: I was rereading chapter 1 and I noticed that Moribayashi mentioned that Yūma transferred near exam time, which takes place in July, December, and March. Combined with what you said, it's fair to assume that the story begins in December, plus, I doubt Yūma stayed with Osamu very long before Border found him.