It's one of those Japanese propaganda manga, denying what happened in nanking, making themselves look good, waste of time.
Wish the artist collabed with someone who actually knows how to write a story. Beautiful artstyle, eye catching character design, but it all fell short because the story is just appalling.
Only reason why I am reviewing this is because the art is wasted on a trash story.
Honestly just remove this manga from the site.
Overall I give a score of 2 just to be nice to the artist's hard work. In the end it's only my take on the story, but prepare to waste your time.