Kusame has always been in love with Haine, since their first meeting.

This impossibile love makes him jealous and overprotective with her, even if Haine doesn't know his feelings.
Kusame tries to persuade her to leave the Student Council, but Haine refuse because her feelings for Shizumasa are too much intense.
Their relation is intense too, but Kusame is shy and when they're together he fears to make her sad again and again, receiving a big love delusion.