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?

Volume 2 contains the side story Another Light about how Ren and Mayuka first met.

Volume 5 contains the side story Unfinished Map about Ren and Andou's friendship in middle school.

Volume 6 contains the oneshot Colourless Dreamer, which is unrelated to the main storyline.

Volume 7 contains the side story Wishing for Yesterday about Yuu and Sayuri's past.

Volume 10 contains a side story about Manabu's love.