Seven years ago the Kyuubia attacked Konoha but was stopped by the fourth hokage and sealed into his two children with Naruto getting the soul and Mito the chakra. Ever since then Naruto has been seen as nothing and his parents have neglected him for Mito and trained her early since she has the Kyuubia's chakra while he was left behind. There was also the beatings he got from the villagers thinking he was the demon in skin. Sooner or later he decided to grow strong as was able to get into ANBU at the age of six as he was a prodigy and was the most feared ANBU in Konoha, but his parents didn't even notice when he was gone some days because of missions or how his father hasn't notice him in his gear, but that is what happen when you get ignored and forgotten. But hey at least he meant some great people in ANBU like Kakashi&Itachi.
As Naruto is heading out for a mission he hears his parents talking about what to get Mito for her birthday but not him, but hey that is to be excepted of him.