Strobe Edge

Strobe Edge (ストロボ・エッジ, Sutorobo Ejji) is a manga series written and illustrated by Io Sakisaka. It began serialization in 2007 in the shōjo manga magazine Bessatsu Margaret and ended in 2010. The chapters are collected and bound in tankōbon format by Shueisha under the Margaret Comics label. The manga is licensed in North America by Viz Media with its first volume released in November 2012. A live-action film adaptation had its theatrical release on March 14, 2015.

Plot
Having no experience in romance, the vibrant Ninako curiously explores the meaning of what "love" really is, and is surprised to feel a colorful range of emotions as she grows closer to the school heartthrob, the quiet yet gentle Ren, who also happens to be involved in a longtime relationship. With every intention of keeping her head held high, Ninako prepares to face the mental pain of this one-sided love that she had allowed to take root, facing a series of trials that would either contribute to her growth as a headstrong woman, or break her as it did with other girls.

However, is this really a one-sided love? Or had something been silently sown in the most hidden part of Ren's heart?