Whether you call it Demon Slayer or Kimetsu no Yaiba, Kamado Shrine is the place to go for fans of the hit anime/manga.
Honmangu Kamado Shrine, for example, is famous for its cherry blossoms in spring and beautiful red and yellow leaves in autumn.
The backsides of the boards are blank, giving you a place to write the wish you hope for the gods to grant, but at Kamado Shrine, most of the ema these days sport Demon Slayer fan art.