Seikimatsu☆Darling 2006

A couple, Sentarou Katsura and Sanshirou Sakamoto, face difficulties after a friend, Youichirou Takasugi, predicts their breakup. Upset, Sakamoto begins following Sentarou. At the same time, Sakamoto's father visits, urging him to marry and settle down, with Takasugi's sister selected as the bride. Amid these complications, Sentarou's commitment to making Sakamoto happy is tested. Additional relationships, including Takasugi with Ogata, Shikibu with Tsutsumi, Todoroki with Takeru, and Kitasenju with Juujou, intertwine in the story, which also features children.