Katsura definitely

aaaand that's why I love her so much :D

Makoto was just a sick pig, Katsua and Sekai were the crazy ones.

Sekai was crazy she has a lot of screws loose

Katsura became crazy at the end from being effected from Sekai and Makoto.

I think Katsura was crazy the whole time. She just didn't show it until the end. Anyone who can do what she did at the end and not show any emotion is completely insane. At least Sekai actually showed emotion afterwards. Katsura was like a robot in the final episode. And what she did to Sekai was much worse.

katsura katsura? is seriously sekai katsura and makoto killed and then committed suicide

she went coo coo. i wanted an option that said all of them

seriously katsura became nuts...Especially in the last scene I freaked out. It was the scene when she was on a boat with Makoto's head in her embrace...Are we serious...?? But I can't say that Sekai hadn't become nuts...she seriously had problems...especially were she started sending those empty messages to Makoto and then killed him by stabbing him many times ... Makoto was just an ass and pig ...

It was a tie between her and Sekai... until I saw Katsura cradling Makoto's head. That was just messed up.