My Brother's Husband (Volume 1) by Gengoroh Tagame

A Japanese father is forced to deal with his emotions about his twin brother when a large Canadian man arrives at his door, introducing himself as the now-deceased brother's husband.

This was a quick, fun book that dealt lightly with some heavy emotions. Through his young daughter's enthusiasm for life, Yaichi gradually comes to terms with his memories of Ryoji's coming out and his feelings about his gay brother-in-law Mike. 

Traditional Japanese social rigidity limits any adult show of emotion, and Ryoji is sometimes jealous of Mike's ability to hug Kana at will and to openly cry and express his grief. Kana's buoyant excitement in discovering she has an uncle to introduce to her friends and show around town acts as a catalyst for the two men's friendship.

There's obviously more to the story, and I'll be interested to read more about these complex characters.