Receiving a watching with 〜れる


Grammar Explanation

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After Chino leaves to get Cocoa’s uniform, Cocoa feels she’s being watched, even though there shouldn’t be anyone else in the room. (She is receiving watching by someone.)

ココア:
(だれ)いないはずなのに(だれ)()られているような」

()‘s negative stem is (). Append られる for ()られる.