Three's a crowd. Ranmaru and Kei have a strong and passionate relationship built on years of trust, sacrifice and love. When the mysterious son of a Yakuza boss starts to have designs on Ranmaru's affection, tempers flare, and hidden emotions rise to the surface. Will Ranmaru and Kei's love for each other be able to survive this difficult test, or will the emotional conflict finally come to a head? (Source: Be Beautiful)

Kizuna had nine volumes published in English as Kizuna: Bonds of Love by Central Park Media's Be Beautiful imprint from August 25, 2004 to August 1, 2007. After the publisher went defunct, Digital Manga Publishing picked up the license and released the entire series as Kizuna: Deluxe Edition under its Juné imprint in six 2-in-1 omnibus editions (the last volume is not an omnibus) from October 13, 2010 to May 30, 2012. It was also published digitally as Kizuna: Bonds by Fantasista Inc. through futekiya from December 10, 2021 to October 13, 2022.