With next year's university entrance exams looming, high school senior Yoshiyama Mihane is beginning to feel the blues. She recently joined the school's photography club. As she walks by the science lab one day after school, she smells the aroma of lavender. From that moment on, she acquires the ability to leap freely through time and the days ahead are marked with bizarre occurrences...

Fukamachi is Mihane's classmate and childhood friend. Or at least that's what everyone thinks. The truth is, Fukamachi came from the future, where he is a brilliant researcher who develops a drug that enables time leaps. He uses the drug to visit the year 2016 but loses it and is unable to return for the time being.

Her romantic feelings for a boy that came from the future lasts but a few days, and those memories are now beginning to fade.