well that is just shitty, I wish Chika would get his own story and find some hot tall dark and handsome guy to be with! Curses! No need to feel obligated to marry a chick cuz your family said so.
I feel you. I am totally pissed off at how this manga ends. What happened to Chika was stupid and sad.
Do you have a link? I can read a bit of japanese
http://www.yaoiotaku.com/forums/threads/49794-Mamanaranai-Mon-de-%E2%9C%B2-ASOU-Kai-JP
You just need to make an account to download the files.
Chica ends up getting married to that girl and Hotaka and Masato end up staying together for what I could tell by looking at the raws.