Saeko Mizuno was a doctor... but of what? Not even Ami knew what her own mother did for a living. But, now, with Saeko dead and Sailor Mercury missing, it's up to a ragtag group of people to rescue the lost Senshi. But, just how much Usagi can Sousuke deal with? And what's worse, Tessa insisted that Kaname join them, further complicating the mission for the poor Sergeant.