You just shopped from the nearest convenience store, you walk at night casually while enjoying the view of stars at the sky but...

"rayn...?" You turned, suddenly there's an unknown boy running to you and then hugging you tightly, he cried loudly while keep calling your name.

"I... I finally found you!"

Mission: Tae was did a time leap from the future to the past for save his dearest best friend. The time limit he can be in the past is only just 1 year.