How to Get Sacred Treasure in Anime Adventures

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Fast answer: run Infinite mode portals - especially the Shibuya secret stages - and watch the buff icon on the bottom-left; it can double your Sacred Treasure drops. Then take the currency to the Gambler NPC outside the Summon area to buy Dungeon Keys and event-shop items.

Every source

1
Infinite mode portals (main farm)
Portals spawn during Infinite matches after story mode clears - finishing a portal challenge pays Sacred Treasure. Shibuya portals drop the best rates, and the bottom-left buff can push drops up to +100%.
2
Daily login rewards
The daily reward track hands out a free Dungeon Key plus other items - log in even on days you don't grind.
3
Dungeon runs themselves
Chests inside dungeons pay out items and currency - spending one key to earn treasure back is a fair trade once your team can clear mid-depths.

Spending it - the Gambler

The Gambler stands outside the Summon area in the lobby - talk to him and choose "Open Shop". His stock restocks daily, so prices and bundles vary.

Buy	Cost	Why
3x Dungeon Keys	10 Sacred Treasures	Entry to the 20-depth Dungeon - secret units at the end
Event shop items	daily stock	Exchange rewards rotate each day

Dungeon basics: each key buys one randomly generated run - 20 depths of rooms with chests, shops and cursed items. Open chests early at checkpoints or hold them to the end for a shot at a limited secret unit. Quitting early forfeits both the key and your loot.

FAQ

Best farm rate?

Shibuya portals during Infinite runs with the drop buff active - that's the combination players use to stockpile fast.

Is Sacred Treasure tradable?

No - it's account-bound event currency; the only sink is the Gambler's shop.

How much do I need?

10 treasures per 3-key bundle - a couple of focused Infinite sessions covers a dungeon attempt.