This one was fun to figure out. All of these photos (get very close to) hitting the bullet cap. It's not visible in the second photo, but the second bubble wave only shoots 3 bubbles if I remember correctly.
The trickiest part of optimizing this is getting Suika to move to the middle, since the normal movement pattern doesn't allow for this. You gotta lure Suika somewhat outside of this box of bullets so she ends up in the middle of the bullets.
Deciding how many bullets my defensives get also matters, since I don't want to delete too much of an area and too many bullets. This also matters because if I have to go too much out of my way to get a good defensive, I won't have enough time to misdirect Suika properly.
Aside from that, I keep the pattern mostly in the middle, because when taking defensives, the photo will only go partly offscreen and I'd rather avoid having to shrink my photo, since that wastes frames.
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