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Each of the arcs of the Monogatari series so far (Hitagi Crab, Mayoi Snail, ..., Hitagi End) has had an OP theme sung by the arc's heroine1, save for Shinobu Time (i.e. Onimonogatari), which did not have an OP theme at all.
What gives? Shinobu's voice actress is Maaya Sakamoto, who is probably t...