Valentine's Gacha: Last Night of Love, First Night of War [February 13 ~ February 14]
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I actually think this is one of the better Gachas, it gives a 5 star for 1500NG (regular price) plus the bonus stuff. Then, a 6 star for 2000NG (500NG less than regular price) plus the bonus stuff. Sure it's random, but 2000NG for any 6 star is good.