While I have no plot currently laid out for the hypothetical Sakura Taisen Step, I am inclined to set it in the obscure period of time delineated by the events recounted by OVA 2 -- definitely before Ohgami's departure, perhaps in the midst of the stuff he's reminiscing about as he packs.
-- Bob
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There's no wrong way to eat a Rhesus.
-- Bob
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There's no wrong way to eat a Rhesus.