Oshi City is a modern city that serves as the setting for the first act of Mark of the Ninja. It is home to both the Hisomu Clan and Hessian Services. Being in such close proximity brings the two organizations into conflict with one another.
| Mark of the Ninja Levels |
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| Outset: Hisomu-jo, Home of the Hisomu Clan Ink & Dreams Act I: Oshi City, the Urban Jungle Act II: Hessian Castle, the Fortress of Count Karajan Act III: Tabriz, Source of the Sumi Finale: Return to Hisomu-jo |