>>49649588
Larva is cute.

But anyway, this isn't too much of a challenge, fortunately, and it makes for the ideal usecase for PRINT_STR.
The thing to remember is that 解説文 is just a variable containing an array of strings, and cannot hold any instructions, so what we want to do is fill it with markup and then use PRINT_STRL where it's actually getting printed to the screen.
Replace the line of code in the image at the end of @SHOW_MUSHI_DATA in "COMF449 虫捕り.ERB", and it'll take care of the printing part of it.

This only leaves the actual markup, which is handled like the first part of >>49648642 :
It's got a fair number of options for both color and styling, so it should cover all of your possible use cases.

>解説文:2 = It reminds you of @HEX@{C_TEAL}@Eternity Larva@, @STRIKE@who is most definitely just a cute fairy@.
The form is that @ is used for the markup and possible arguments, with the first one denoting the kind of markup you want to perform, and the last one always being the text it should be applied to. If there are any arguments, it comes right after the command. This particular line colors the text "Eternity Larva" in a teal color defined in DIM.ERB (which also contains many other preset colors), and then puts a strikethrough through the "who is most definitely just a cute fairy" part. It would also be possible to do both once, which would make it something like "@STRIKE@HEX@{C_TEAL}@who is most definitely just a cute fairy@".

I'll list the most applicable options here for future reference:
>@BOLD@Test to be bolded@
>@UNDER@Underlined text@
>@ITALIC@Italized text@
>@STRIKE@Strikethrough text@
>@HEX@[Int value of color]@Colored text@
>@RGB@[R]//[G]//[B]@Colored text, but from RGB values between 0-255@

I hope this is enough to get you going. You're doing good work here.