Asu kara Orera ga Yattekita (Volume)

is the first volume of the Asu kara Orera ga Yattekita light novel series, written by Rin Takagi and Illustrated by Gin. It was released under the Dengeki Bunko Imprint in February 2012.

Synopsis
Should I enroll by recommendation and be popular with girls, or should I take the upper university entrance exam to get a good job? I'm worried about my career without youth, and in front of Masato Sakurai, a third-year high school student, "I" has come over time from the future! Besides, there are also two people !! Chara man and Masato Sakurai who is a gully student ... Is it really me !? …. A futuristic romantic comedy with "us" who has grown up a little! (... Is it !?) The 18th Dengeki Novel Grand Prize  winning work.

(source: Bookwalker JP - Translated)