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Setsubun Event was a limited story event in the Seraph of the End: Bloody Blades game that was available for viewing from February 1, 2016 to February 5, 2016. It was held to commemorate Setsubun - the day before the beginning of spring in Japan.
By clearing the quest and reading the limited event story during the 4-day period, players were rewarded with Cursed Demon Stones.
To be added. Click here for the Japanese transcript of the event story.