Nao Okuda
Sumire with Nao's glasses Nao and Sumire are both the first year students and are placed in the same class, making them close classmates to each other. Nao and Sumire are often seen together while their seniors are out, either applying to university or for a trip, and are often seen alone together in the music room. In the manga, there are quite a lot pictures of them being together. A huge step in their relation was when Nao invited Sumire to her home, where Sumire met Nao's brothers.
Jun Suzuki
Jun and Sumire Jun had always adored Sumire's cake, and just like Yui or Ritsu, cakes are her power source. Jun is also impressed with the villa that Sumire uses for the girls' training camp (owned by the Kotobuki family).
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