Board Thread:Questions and Answers/@comment-33485506-20171026045925/@comment-25444060-20171111063917

Heroes don't need to class up and he didn't have a star. When Raphtalia and Firo reached Lvl 40 ★, Naofumi was still at 38 anyway. It was around chapter 45 that they discussed it and they messed around town until the next wave. After which they do the whole church thing and the queen helps them do the class up. I don't recall them ever mentioning levels in between the third wave and their class up so I can only make assumptions but he doesn't actively participate in the class up which reconfirms that he doesn't need it.