I'm going to list all the ones I've read here, instead of writing a new thing for each one. Done; 1,2,3,4,5,6,7,8, & 9.
Fast-paced, succinct, action-oriented, with exaggerated drama in the cartoon characters' faces, make this feel like it's in motion - it feels like a graphic novel adaptation of an animated movie.
It's easy to get attached to the 2 main characters in the opening volume - Yaya, a precocious piano-playing wealthy girl, and Tuduo, a clever & competent street urchin & acrobat who is trying to care for a younger sibling - in 1937 Shanghai, about to get bombed by the Imperial Japanese Army. That their faces resemble so much anime makes it easy to imagine their movements even on the frozen page.
Maximum details - hundreds of windows on buildings, thousands of leaves on bushes & trees, fabric patterns, bricks & tiles - make a background for the figures to clearly lay atop, making the action legible & easy to follow.
I think readers will want to read all 9 episodes when they get started...but for me it became repetitive - the characters travel one way, then another, out & back, crisscrossing one another with missed connections, implausible obstacles, & freakish luck - both good & bad.
I thoroughly enjoyed volume 1, and eagerly read the rest -- but as an adult reader, it was obvious that the authors (who are not Chinese & therefore are unlikely to bring any sensitivity to this historical moment) didn't think it would be necessary for the readers or the main characters to know anything specific about this battle in Shanghai. However, to be sure, the illustrations include a ton of background signs & posters that could be filling in info for anyone who reads Chinese. Unfortunately, it's the English-reading audience who doesn't know this history!
Okay, I finished the series, finally - the last book took some time for my hold to be filled at the library. The last volume felt as rushed as all the previous ones, and it ended. It was not a very satisfying conclusion, but I was tired of the villain & his insane perfect luck, and the ups & downs - hopes sustained, then dashed, then reinvigorated, then dashed again! - had become exhausting. So I'm glad it's over! : )