Itsuka Wa Kuma Goroshi is a Yaoi manga which has been written primarily for a male audience and hence features bulkier men with less feminity to their characters. There is no clear alpha or omega and features very balanced relationships.
Itsuka Wa Kuma features a bunch of friends and their own journey to finding true love. Each of these characters has their own stories and they are connected to the previous one in some way or the other. The manga begins when the good looking well built Siro gets dumped in a crowded place by his boyfriend.
He finds himself very heartbroken and ends up in the bar with a cloud over his head. There he meets a handsome young man Takuya, Takuya wonders why Shiro gets dumped every time. When he looks at him, he sees a capable good looking man who is caring and kind.
There are no apparent personality flaws and no big red signs. He becomes curious in his case and decides to help him find out what’s wrong. In the meantime, Shiro starts falling in love with Takuya.