Nezumi was raised by the yakuza to be a killer. It's all she's ever known. Love is something she's never experienced or even contemplated…until she meets an ordinary, hapless young man named Ao in an arcade during a hit. Suddenly thrust into the simple bliss of shared dinners, video games, and bashful intimacy, Nezumi is happy for the first time in her life. But her masters were never going to allow the dream to last forever. Now Nezumi has to make a terrible choice to save Ao's life—and her own. How far will this killing machine go to assert her humanity…?

Volume 1 of the Nezumi's First Love manga series by Riku Oseto.