Riona Hibiki takes an elementary school common sense test and learns for the first time that the headache after eating something cold is formally called an 'ice cream headache,' realizing she had mistakenly been referring to it as 'hypersensitivity.' Viewers correct her that hypersensitivity is a tooth condition, and Riona excitedly tries to find her own cute way of saying it, leading to a lively reaction.
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