恋は戦争 (Koi wa Sensou)

恋は戦争 (Love is War) is a song composed by Ryo and sung by Hatsune Miku. It is one of Supercell's Greatest Hits, and One of the Top Favorite Hatsune Miku Songs as recognized by fans.
 * Nicovideo Broadcast
 * Youtube Broadcast

Background
This song is about how Miku's crush is in love with someone else and she will fight for them. Miku declares that "Love is war" and that in the end, she will make her love only see her.

Love is War has been a very popular song and has covers by almost every official vocaloid. Due to the songs popularity, it has been translated many times in various languages by different translators and although the lyrics may slightly change, the overall meaning is the same.

There is even an Album dedicated to the song, entitled Eager Love Revenge, with various remixes from many Artists including Ryo himself.