Touka was suffering from crushing survivor's guilt combined with the also crushing inferiority complex she had from her more popular sister Ryuuki. I'm surprised she was actually considering sacrificing him just like he thought, but maybe when she thinks he didn't feel anything for her... and then he ruined that and saved himself at the same time by confessing his feelings(?) for her.
Somehow I'm not too convinced he's actually, truly in love with her. Maybe just a little.
Well, whaddya know we got some kind of ending after all. Maybe I'll just pretend there's no other problems left in the world caused by that scam of a wish granting tool. The other characters didn't exist, I didn't see anyone else...
Thanks for bringing us to the end for this manga!