Honestly, turning a gacha mechanic into a plot device is such a neat challenge. The most straightforward angle is making it literal, like a cursed artifact or a divine lottery that heroes have to engage with. But the deeper potential is in exploring the psychological toll. Imagine a system where summoning legendary spirits or unlocking magical artifacts is tied to a character's luck or life force, creating a brutal economy of hope and despair. It could critique the very nature of power being random and unfair in their world.
I'm thinking about stories where the 'pulls' aren't just items but memories, personality fragments, or even alternate timelines of the summoner. Each summon changes the protagonist in subtle, irreversible ways. That feels more fertile ground than just a weapon-of-the-week generator. The tension isn't about getting the rarest thing, but about whether the next pull will save you or fundamentally erase who you are.