A sticker set featuring skull designs from The Birthday. Includes 4 stickers. Two stickers are from a set of goods, one is a bonus from the single "Aozora" (Blue Sky), and one is a bonus sticker from the album "Vivian Killers." They have been stored at home without being used. Individual sales are also available. - Design: Colorful skull design stickers - Text: The Birthday Vivian Killers, Yusuke Chiba, Kazuyuki Kuhara, Haruki Hirai, Kenji Fujii