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* ActorAllusion: Sonoko had a dream where Sumi became an IdolSinger. Sumi's voice actress, Creator/SuzukoMimori, is famous for voicing [[Anime/LoveLive Umi Sonoda]], a (school) idol who shares a lot of traits with Sumi herself.
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* PortmanteauSeriesNickname: "[=WaSuYu=]" is the official series portmanteau.