Usagi Yojimbo: The Hidden — Dark Horse Comics
Issue: #4
The only person who knows the true contents of the mysterious box Usagi and Detective Ishida are tracking escapes from custody--and then hired assassins attack Usagi and Ishida! The realization that someone has been following them all along leads to a plan to seek help from a very unexpected source.
Creators: Philip Ray Simon, Cary Grazzini, Tom Luth, Megan Walker, Julie Fujii Sakai, Stan Sakai
Characters: Usagi Yojimbo, Nezumi, Inspector Ishida