yuri's activites

From Exiled Rebels Scans:Tachibana Yuuichi, who lost both of his parents and sister in a traffic acc...

= couples who are blood-related or know each other somehow otherwise

additional are the series in the following lists:
http://www.mangago.com/home/mangalist/6968/
http://www.mangago.com/home/mangalist/7543/
http://www.mangago.me/home/mangalist/8347/?filter=&page=2 (just the Kuroneko series)

...