Key: The Metal Idol

Ah, this is a really satisfying episode... so much so that you end up wishing the whole series ran at this pace. First, you've got Tsurugi being Tsurugi. Then there's Ajo trying to milk every drop he can out of Miho. (Recording singles in the ICU, anyone?) Prince Snake-Eye is doing his level best to put the fear of god into anyone who's even thinking about giving Key a try-out. And Shuichi decides now's a good time to go play private investigator in Mamio Valley (where Key and Sakura grew up). Amazingly, he actually manages to turn up a few clues about the life and death of Key's 'grandfather', Doctor Mima. And if that isn't enough action for you, Ajo craves screen time and keeps cropping up, first selecting new girl Beniko as Miho's soon-to-be replacement... and then crossing paths with Shuichi in Key's old village!