The in The Seven Deadly Sins: Grand Cross refers to Kodansha's 35th anniversary of Weekly Shōnen Magazine (where the 7DS manga was serialized). Netmarble ran a special login event and coupon campaign around late 2024 – early 2025 (not 2026).
Redeeming the box code is relatively straightforward. Here's a step-by-step guide: 7ds grand cross 35 anniversary box code work
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3.5 Anniversary Secret Box The Seven Deadly Sins: Grand Cross Redeeming the box code is relatively straightforward