In Wonder Egg Priority, when Neiru is first introduced, it's established that she started buying Wonder Eggs long before Ai, and often buys several at a time. Despite this significant head-start, Ai manages to revive Koito before Neiru is able to revive her sister. In fact, as of the end of Episode 12,
Neiru is the only one of the four protagonists who hasn't revived their loved one yet.
How is this possible? Did Ai really overtake Neiru in terms of Wonder Eggs hatched? Or did Neiru have a higher target to begin with?