"Koi wa Sensou" is a rock-genre song about how Miku will fight to attain her crush, who is in love with someone else. Miku declares that "love is war" and that in the end, she will make her love see only her.
"Koi wa Sensou" is one of Miku's older hits and has covers featuring almost every official VOCALOID. Due to the song's popularity, it has been translated many times into various languages by different translators. Additionally, it was the eighth song to enter the Hall of Legend, on November 4, 2008.
"Koi wa Sennou" (恋は洗脳 Love is Brainwash) was a project headed by Wakusei-P, where producers created works based on "Koi wa Sensou" from September 16 to October 31, 2009. This resulted in the creation of numerous remixes and illustrations. Results were included in an album included with a illustration book sold by Shirow Miwa at Comiket.
There is an album dedicated to the song, entitled Eager Love Revenge, with various remixes from some of the most popular producers in to VOCALOID community, including kz, 40meterP, and DECO*27, in addition to ryo himself.