The primary feature of a "Megapack" is completeness. Unlike downloading single scenes, a megapack is curated to include the actress's entire filmography or a specific era of her career. For Airi Kijima, this would include titles released under major labels like Moodyz or IdeaPocket, spanning from her debut through her retirement (or current activities).
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For the casual browser, a 50GB download is overkill. But for the dedicated collector, the J-drama historian, or the aspiring photographer studying the lighting techniques of late-2000s gravure— The primary feature of a "Megapack" is completeness