Must-see/read: The first volume, all of it is fantastic; by the end of chapter six the relationship between Godai and Kyoko is so complicated you can't help but come back for more. Any chapter with Kyoko's mother is fun. Everything after Asuna Kujo enters the story - she's not a unique character in any way, but the way she affects the characters she's most directly linked to is of great importance. And of course the final volume is just beautiful.