- Fair for Its Day: The iffy gender politics are somewhat excused by the fact that it was written in The Fifties. There's a definite pro-gender equality message in the story, but for modern viewers/readers it can be easy to not notice that because of all the characters going on about how men are inherently stronger than women.
- Hilarious in Hindsight/Harsher in Hindsight: Whichever this manga exemplifies is up to you, but the possibility of a man's soul being within a woman's body and vice versa brings many current issues involving the LGBT community to mind.
- Older Than They Think: Sapphire having both a boy's heart and a girl's heart is reminiscent of Two-Spirit people.
- Values Dissonance: Someone in the 2000s would disagree with a lot in this show, because it was made in the 1950s.
- Viewer Gender Confusion: Sapphire for one.