Yukiya Shōji (小路 幸也) made his debut as a writer by winning the 2002 Mephisto Award for Sora o miageru furui uta o kuchizusamu (Singing an Old Song about Looking Up at the Sky). Among his many works published since then are the Tokyo bandowagon (Tokyo Bandwagon) series, Cow House, and Hanasaki kōji yonchōme no seijin (The Holy Man of Hanasaki Street). He works at the entertainment end of the literary spectrum, in genres ranging from family novels to mysteries.
I would describe this episodic novel about a large family that run a second hand bookshop as cozy mystery. There's nothing life threatening or too dramatic, but each chapter has two or three mysteries on the go involving different members of the family and they're neighbors and friends.
The multiple story threads weaving in and out weren't that difficult to keep track of. Neither was the large cast thanks to the character list at the front of the novel.
I did find some of the resolutions to the mysteries a little trite, but overall had a good time with the story.