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"Setsuna is very devoted to Sekai, willing to give up her own happiness in order to help Sekai, shown in the anime when she frequently helps Sekai with her feelings for Makoto despite having feelings of her own for him. She is also constantly worried about Sekai and tries to make sure that Makoto will keep Sekai happy. This leads her to go so far as to try to eradicate Kotonoha from Makoto's love life by cutting short any interactions they had while she was around, although this was only done for Sekai's sake and she didn't hold any grudge against Kotonoha. Although silent-looking and almost emotionless, she is conscious about her underdeveloped body, especially in comparison with Kotonoha and Sekai."

Source: BookRags