Naruto: Konoha's Boxing King

[No cheats, no dumbed-down characters, slow burn, a little wish fulfillment, character growth, tactical battles, and mind games] How would a boxer grow after transmigrating to the Hokage world? Become the shinobi world's boxing champion? No, he wants to become its strongest fighter! When he woke again, he had transmigrated to the Hokage world and become a member of the Hatake Clan, a distant relative of Kakashi. After his parents were killed, border shinobi found him and brought him to Konoha, where he became part of Kakashi's family. He swore that in this life, he would make a name for himself in the shinobi world. After tricking Orochimaru into giving him the Cursed Seal of Heaven, he developed a Cursed Seal Sage Mode. Combined with the Eight Gates, it made his fists seem demonic when fully unleashed. Even Madara would have to take a couple of solid punches.