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

a letter of resignation / a formal document of abdication when one emperor steps down and a new emperor ascends the throne

a document with the emperor's seal

Kanji dictionary; Han character dictionary

daycare

shine / weekday / day (of the week)

a chivalrous person / a tomboy