While being no more than a typical (but good) science-fiction series involving a love story, it obtained a lot of fans due to the sympathetic and developed characters, such as Eureka, Renton and Holland. It was one of the most memorable anime of 2005 and the most people think of it as an interesting and enjoyable anime.
Renton: You're beautiful!
Eureka: *Weird searching look*
Renton: Can i touch it?
Eureka: *Hides her butterflyness*