在 Heartwork: Love Guns中出现的主人公是一把手枪，柯尔特自动手枪1911A1。这把被诅咒的枪已经存活了半个世纪，现在仍然渴望人类的血液，并且仍然在某处继续履行它的使命，不断吸食着某人的血。另一名主人公朝倉優(あさくらゆう)是一个平凡的学生。他过着懒散的日子，每天与朋友们闲聊，偶尔会对异性心动。某天，他偶然获得了这把被诅咒的手枪。从那一刻起，他所面临的选择出现了分歧。

森川由香里(もりかわゆかり)

隶属于警视厅公安二课的女警，一直在追寻那把被诅咒的手枪并与優接触。

In the past, police have discovered that a gun that was used in several murder cases had a "curse" to it, and whoever wields the said weapon is unable to hold back any wild or dangerous intentions, which usually end up with someone getting hurt. With this as the root of the story, there comes Yuu Asakura, a student at a university. Yuu is a normal student. One day when he comes home he finds a duffle bag filled with money, a gun and orders for an assassination. After considering and taking the job he enters a dangerous world of sex, guns, and violence.