“a hundred days of sermonizing, one fart” → a metaphor for how something that one has put great effort into can come to nothing after even a slight mistake, much as a hundred days of serious spiritual study can be lost to the winds

the Hundred Schools of Thought

Kyūjitai form of 漫画家

Hakka (Chinese lect)

cat lover

Kyūjitai form of 小説家: novelist

Zhangjiakou (a prefecture-level city in Hebei, China)

the Baijiaxing (Hundred Family Surnames), a classic Chinese text composed of surnames

Kyūjitai form of 縦横家 (“School of Diplomacy”)

the most noble three branches of the Tokugawa clan (徳(とく)川(がわ)氏(し) (Tokugawa-shi)): 尾張(おわり) (Owari), 紀伊(きい) (Kī), and 水戸(みと) (Mito) / (figuratively) the "big three"