Cover strip system, provided to be fitted in the region of a joint between two walls (30, 32, 50) arranged approximately at right angles to one another, comprising a cover strip having two legs (12, 14) arranged at right angles to one another and a separating strip, wherein the cover strip has a connecting element, wherein the connecting element a) connects two strip legs (12, 14) to each other so that they form an angle z' of 90°±10° with respect to each other for assembly, wherein they span a space between each other; b) has a groove which, for assembly, accommodates the separating strip in such a way that it can later be removed again from the groove, wherein the groove has a groove opening which opens the groove towards the space, and wherein the groove has a virtual groove center plane which is aligned between the strip legs (12, 14) in the space at an angle x' of 45°±5° to each of the strip legs (12, 14), and wherein a first strip leg of the two strip legs (12, 14) is provided to be fixed on a surface of the first wall (30, 50) facing the space and a second strip leg of the two strip legs (12, 14) is provided to be fixed on a surface of the second wall (32, 50) facing the space, wherein the connecting element has a central body in which the groove is integrated, wherein the groove has a groove bottom which is arranged on the groove center plane opposite the groove opening, and the groove bottom is designed in terms of its material and the material thickness in such a way that it can be severed, characterized in that the connecting element has two connecting flanges (64, 66) which lie in a flange plane and connect the strip legs (12, 14) to one another, wherein the strip legs (12, 14) and the flange plane enclose an angle v' of 135°±5° and the groove with its groove opening separate the two connecting flanges (62, 64) from one another, and the central body has a thickening in which the groove is integrated, wherein the thickening extends in the opposite direction to the space with respect to the flange plane, and wherein the groove bottom, in the thickening of the central body, has a thickness which is small compared with the thickness of the side walls of the groove. a) connects two strip legs (12, 14) to each other so that they form an angle z' of 90°±10° with respect to each other for assembly, wherein they span a space between each other; b) has a groove which, for assembly, accommodates the separating strip in such a way that it can later be removed again from the groove, wherein the groove has a groove opening which opens the groove towards the space, and wherein the groove has a virtual groove center plane which is aligned between the strip legs (12, 14) in the space at an angle x' of 45°±5° to each of the strip legs (12, 14), and wherein a first strip leg of the two strip legs (12, 14) is provided to be fixed on a surface of the first wall (30, 50) facing the space and a second strip leg of the two strip legs (12, 14) is provided to be fixed on a surface of the second wall (32, 50) facing the space, wherein the connecting element has a central body in which the groove is integrated, wherein the groove has a groove bottom which is arranged on the groove center plane opposite the groove opening, and the groove bottom is designed in terms of its material and the material thickness in such a way that it can be severed, characterized in that the connecting element has two connecting flanges (64, 66) which lie in a flange plane and connect the strip legs (12, 14) to one another, wherein the strip legs (12, 14) and the flange plane enclose an angle v' of 135°±5° and the groove with its groove opening separate the two connecting flanges (62, 64) from one another, and the central body has a thickening in which the groove is integrated, wherein the thickening extends in the opposite direction to the space with respect to the flange plane, and wherein the groove bottom, in the thickening of the central body, has a thickness which is small compared with the thickness of the side walls of the groove.