The main female characters in both series are married but entangled with men much younger in an affair. Both female leads are rich, whilst the male leads are more on the poorer side. The male leads are both university students. There is a secondary couple in Tokyo Tower, and Pale Moon has two.
There is an age gap, the female lead is older than the male lead.
Female Lead have a husband.
The male lead becomes obsessed with the female lead after getting to know the female lead.
