モノクロ∞ブルースカイ (Monochro ∞ Blue Sky)

Background
Also known as "Monochrome∞Blue Sky", "Monochro∞Blue Sky" was uploaded on March 25, 2010, and has since reached over 1,000,000 views.

It tells the story of  a depressed girl who can't find her reason for living, so she wants to end it all. In the end, it seems she finds what she's looking for, or comes to a realization of sorts, and tells herself to become more positive.