Boku wa Imōto ni Koi o Suru(僕は妹に恋をする, lit. I Love My Younger Sister) is manga series by Kotomi Aoki. Originally serialized in Shōjo Comic, the individual chapters were published in ten tankōbon volumes by Shogakukan from May 2003 until August 2005. The series focus on fraternal twins Yori and Iku, who fall in love with one another despite being siblings.