Hmmmm maybe there is hope for this. This is a great reversal. He has started taking her for granted and probably feels there is no hope for them to blossom into anything besides what they currently have. Her influence over him has made him not see her in the feelings he initially had blossoming at first. BUT now there is a third element. A girl, Kaga, who will probably get interested in our boy. This will spark some hard feelings in Sasha me thinks. Jealousy and a push to wanna be with him in more of since then pleasure. The hope that dwindled for this series in me has been a little rekindled.
Note: I dread that HaguHagu is probably gonna launch doujin on the new girl.