page 2 : the girl who says "i pledge allegiance" , she wears handcuffs and torn clothes , so she was probably the queen / princess of a defeated country , and then she becomes prisoner of war / $ex slave , lol .
page 5 : they use the word "天下人" , it could mean 2 different things :
- everyone / normal people / country people .
- conqueror / ruler / king / emperor . that is why they talk about the king in the movie and japan 's 3 greatest rulers .
天下 : https://en.wiktionary.org/wiki/%E5%A4%A9%E4%B8%8B .
page 8 : the joke "3-days tenga" comes from the history of Mitsuhide : his reign as shōgun lasted only 13 days, hence the reference "thirteen-day shogun" . The short reign of Mitsuhide is listed as the inspiration for the yojijukugo set phrase mikka tenka (三日天下, 3-days reign) .
page 14 : 1 movie poster is "Your Eyes" , probably a parody of this : https://en.wikipedia.org/wiki/Your_Name .
the other poster has this kanji : https://en.wiktionary.org/wiki/%E8%8D%92 .
page 18 : the movie poster in the background is probably a parody of Doraemon .