[email protected]'s manga / #childhood friends(3)

I just wonder, so, the story's timeline is like developing from the present (after the white hair guy being "kidnapped" or so he said, suddenly comes back in front of the spiky haired guy's apartment door), going backward to when they used to be friends in high school (now the spiky haired one has graduated and the white hair starts to go back to school). So it's not a linear story line right? :3 just feel a bit confused here...