[OP06-072] - Cosette (Wings of the Captain)

My Leader has the {GERMA 66} type and the number of DON!! cards on my field was 2 less than the number on my opponent's field when my opponent's Character attacked. My opponent's [When Attacking] effect reduced the number of my opponent's DON!! cards, meaning I no longer have at least 2 fewer DON!! cards on my field than my opponent. Can I activate this Character's [Blocker] in response to this attack?

No, you cannot.