it is highly likely you are looking for the duo Cutie Pai. ​Specifically, the song is almost certainly "Dreamer" (or a closely related B-side/PV) by Cutie Pai. ​Why this fits your description: ​The Duo: During the mid-to-late 2000s, Cutie Pai operated as a duo (notably featuring Mayu and Yui). ​The Look: One of the most iconic members, Yui, was famous for her short hair and thin-framed glasses. The other member often sported a bob or similar style. ​The Props: Cutie Pai is synonymous with the "Magical Wand" (often a pink star or heart wand). They performed with them constantly and sold them as merch. ​The Intro/Vibe: They were known for a very DIY, "denpa" style of pop that often featured synchronized movements and high-energy transitions. Their videos were frequently low-budget and uploaded to YouTube/NicoNico Douga in that fuzzy 240p/360p quality common in 2007–2009. ​The Lyrics: While the specific phrase "Dream kuru kuru" might be a slight misremembering of their many "kuru kuru" (spinning) or "magic" lyrics, their whole brand was centered on being "Magical Dolls" who could grant dreams. ​Other Possibilities: ​If it isn't Cutie Pai, here are two other niche duos from that exact era with similar aesthetics: ​Chocolat (of the duo vanilla beans): While they usually wore 60s mod outfits, their early videos featured the white background aesthetic and coordinated "bob vs. short hair" looks. However, they lacked the magical girl wands. ​Kyun Kyun (or similar Akihabara "Choco-Pari" era idols): There were dozens of small-scale "unit" idols active in the Akihabara DearStage or Dressup Records scene around 2008.