"Takara" - treasure It means "Takarabune", the treasure ship of Shichi Fuku Jin (the seven lucky gods). If you want to dream a lucky Hatsuyume, put a picture of Takarabune under your pillow. This kanji should be originally "獏 (Baku)", Japanese nightmare-devouring creature. However, the artist changed the kanji on purpose.
Poetry by 蒼桐大紀 (Aogiri Taiki). Webmaster of novel website Shishiki This poetic form is called Dodoitsu.