The Osawari Tantei soundtrack is pure chaotic DS energy and it rules. Originally a touch-detective game for Nintendo DS (later ported to mobile), and the music matches that weird playful vibe perfectly. ららら商店街 has this shopping district bounce that gets stuck in your head for days, cheerful and catchy in that very specific DS-era way.
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恐怖のみょんみょん星 goes full creepy-cute with this eerie planetarium theme that somehow works as background music for solving mysteries. 踊る！おさわり探偵 cranks up the action energy with a faster tempo and punchy rhythms. The ending track, おさわり探偵誕生日, wraps everything up warm.
Even the bonus tracks have personality. If you miss when DS games had soundtracks this weird and this good, Ozawa Rina's detective agency is still open for business.