Hiroshi loves his family. Today he'll visit his sister Amaya in prison, but things don't go quite as they were planned when he leaves. The "who dunnit" aspect is the main focus of most detectives, for the people close to the victems the "why dunnit" may be more important. The past can't be changed but maybe Hiroshi and his family can learn to understand it.
The comic will, for the biggest part, be in colour and it's made entirely traditionally.