Expecting to be alone with はず


Grammar Explanation

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After Chino shows Cocoa to the changing room, Chino goes to get Cocoa’s uniform. Left alone, Cocoa gets a feeling otherwise.

ココア:
(だれ)いないはずなのに(だれ)()られているような」
“Even though I’m sure there isn’t anyone (here), I feel like I’m being watched by someone.”

Note the presence of なのに.