TOKYO - The operator of the Japanese grilled meat eatery chain Gyu-Kaku said it has discovered an employee embezzled cards from its collaboration campaign with the popular anime "Jujutsu Kaisen."

The employee opened the card sleeves to check their contents, resealing them before giving them to customers or taking them away, operator Reins International Inc. said Wednesday, adding that it was investigating if similar cases happened at other stores.

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