Past, Present and Future (A Nezushi Fan Fiction)

Its been four years since Nezumi left, and Shion has finally given up any hope of his return. In that long period of time, Shion has been reunited with his mom, helped Inukashi raise Little Shion and gotten a job with teaching biology in the local university. His life seems pretty good, until the typhoon came.
Just like all of those years ago, Shion felt the urge to throw open his window, and scream to the sky.
and after that, being the Airhead that he is, he forgot to close it.

Will a reunion come, or will Nezumi be lost forever? Find out in Past, Present and Future.