Write me a description for a Demon Slayer Gift Set. The Gift Set features a 12 Oz. Mug, Crew Socks, and a Christmas Ornament. The mug has a detailed Tanjir Kamado character design, while the socks have Tanjiro's checkered Kimono pattern. The Christmas Ornament is a classic Demon Slayer: Kimetsu No Yaiba design. This is perfect for all fans of the Manga and Anime. The socks are made of a soft and stretchy 98% polyester and 2% Spandex.