暗中: the situation in the dark

(slang) going to or being graduated from the same middle school (中学校)

円柱: cylinder; column

爬虫: reptile

loyalty

a male given name

dog; canine / one who is loyal (like a dog) / a spy

地溝: graben / 地窖: hole dug in the ground, cellar / 治効: treatment efficacy / 知巧, 智巧: ingenuity / 知行: knowledge and action / 恥垢: smegma / 遅効: delayed effect

知行: a male given name

抗日: anti-Japanese