Here we go!
SA Normal with ReimuB (aka Suika).
The run was going pretty good overall. Save for 1-2 failed spell cards from stages 1-4, there were 0 deaths. Enter Stage 5. My lives hit the max by the time I'm at the infamous ghost wheels (even at Normal, they prove to be a problem for me). So I clip a bullet. 1 life lost; point item value goes down (remember, I never died before that).
Stage 6 would be trivial (as it really should be, barring random spray from Utsuho's cards)...
...Enter Utsuho, capturing the 1st card. Bomb the second card once (BS walling of giant bullets). Then clip a blue bullet (-1 life). After recovering, moments later I clipped not once, not twice, but thrice on the last non-spell. At this point, I... was overwhelmed. 3 times?
I denied myself... 75 million points (extend from collecting at least 4 star pieces; 1 from stage 5). Score is standing at 465 million. I would've been at 540 million.