Here we go
The Japanese have the problem sussed out and here are the pictures to prove it
Remove the indicators & headlights first

Then the corner panel above them


Then you need to do a bit of painting

Then a bit of sealing as this is the leaking seam that lets the footwell fill with water

AND tidy up the sealant before you put it all back together again

AND they did this as group while on a trip...how very Japanese....how very Deli.....
Check your drive side floor and Good Luck.
Kevin