Bright bouncy synths crashing in like a sugar rush at full volume. Imouto Paradise! 3 is a 2018 visual novel and the soundtrack is relentlessly cheerful across 31 tracks. "1・2・3☆ぱらだいす!" is the main theme and it comes back in like five different versions: arranged, music box, instrumental.
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They really committed to it. "ドタとバタ" (Chaos and Commotion) has this frantic comedic energy that sounds like someone tripping down stairs in anime form. "夏祭りだよ！お兄ちゃん" (It's a Summer Festival!) brings out the festival drums and that warm nostalgic vibe.
Each of the ending songs carries a different mood, from the soft "さくらいろ" to the explosive "QIエクスプロージョン!" If you need aggressively upbeat background music and don't want to explain where it came from, this works.