“Yūji-kun, you don’t seem well. What’s wrong?” Yūji, who had burned out completely after breaking up with his girlfriend, who they were madly in love with. Ayame, his older sister who was worried about Yūji, who showed no signs of recovering, came up with a special medicine for heartbreak. “Come on, let me rub your breasts and cheer you up! I’ll have you all to myself today!” His older sister, who pushes her big breasts oozing with breast milk without hesitation. Yūji is drawn in by the beautiful big breasts that are even better than his ex-girlfriend and the breast milk he sees up close for the first time….