arma bianca began taking orders on September 30, 2026 for original merchandise from a Demon Slayer: Kimetsu no Yaiba collaboration with Hakone Kowakien Yunessun, sold on the AMNIBUS online store. The lineup was detailed in a PR TIMES release published October 6, 2026, which describes Yunessun as a Hakone resort combining hot springs and entertainment.
Hot Spring Yukata Illustrations
Most of the range is designed around newly drawn illustrations of Tanjiro Kamado, Zenitsu Agatsuma, Kanao Tsuyuri, Giyu Tomioka and Shinobu Kocho in hot spring yukata. Trading acrylic stands come in 10 types at ¥880 each or ¥8,800 per box, and trading mini shikishi art boards in 12 types at ¥660 each or ¥7,920 per box. Trading glitter can badges, also 10 types, are ¥605 each or ¥6,050 per box, and trading illustration cards run 12 types at ¥275 each or ¥3,300 per box. All prices include tax.
Each box of the glitter can badges, or an equivalent number of singles, comes with an AMNIBUS-exclusive preorder bonus: a 75mm Giyu Tomioka glitter can badge in the same hot spring yukata design.
Face towels are ¥3,520 each, measure 34×84cm and are 100% cotton. Extra-large acrylic stands are ¥3,300, BIG acrylic stands ¥1,980 and locker-key style acrylic keychains ¥1,650; each of these comes in five versions, one per character. A3 matte posters are ¥880 in six types, covering the five characters plus a group illustration, and an A4 clear file with the group art is ¥550.
Milk Bottle Cap Motif Items
A second group of items uses motifs styled after milk bottle caps for the same five characters. Trading acrylic keychains come in six types at ¥715 each or ¥4,290 per box. A group T-shirt is ¥5,478 in unisex M and L, and a BIG zip tote bag, roughly 35cm high and 62cm wide with a 16cm base gusset, is also ¥5,478. A ¥2,750 waterproof multi case fits a smartphone, and arma bianca says an iPhone or Android handset can still be operated and used for photos inside the case.