A bunch of songs? Miipan only centered two songs (in Hiragana, none in Hinata), one less than Kyoko (although I always get confused about No War bc some people consider it a Kyoko center and some don't). Katoshi centered two, one in Hiragana and one in Hinata. I wouldn't compare Mirei to Nao. Mirei is my favorite Hiragana/Hinata center but I can see't see her getting a center again soon. But I can see Hina/Nibu/Miru centering this time.