Story of Eastern Wonderland High Score register: as the game has only 5 regular stages, the extra stage is marked as stage 6. If you die before completing the story mode/extra stage, the score register will indicate the stage where you died. If you manage to clear story mode/extra stage, the score register will display "All" instead of the stage number. Extra stage score register screen image was taken from Pruns' video: youtube.com/watch?v=PDDd31QURMg.
The position of 'POINT' and 'ST' texts, as well as the number '10' are different on the stage score register screen that appears if you died before completing the stage compared to the score register screen that appears after you 1CC the regular stages or the extra stage.
After clearing all 5 levels without continues, with all three shottypes, you will be prompted with the 'Congratulation!' image of Reimu, after which the screen fades to black and the High Score register screen appears. When clearing the extra stage, the High Score register screen appears on top of the 'Thank you for playing' image of Reimu.
EDIT (13-Feb-2024): fixed an error in the second paragraph.