- Human ML x Non-Human FL
- Good vs Evil
- Should criminals/bad people die for their crimes?

Very similar in certain topics that are raised during both shows and the theme although Youkai girlfriend has more comedic tones than Judge from hell

Both dramas have a female lead who is a fan of the ML, saving the ML from their future death and both ML are stars/singers.

Both are about catching criminals and have a detective with some sort of power, but in Higanbana; Keishichou Sosa Nana Ka?, she sees the memories of the crime scene rather than the memories of the person

-Bromance
-School Setting
-Swimming
-Cute Romance

I feel like A love so beautiful has a similar setting to My Mr.Mermaid. They both have swimming involved . Though A love so beautiful is more focused around the school aspect whereas My Mr.Mermaid is more focused around the swimming aspect