Ep. 9: Io cooks crêpes and sews Tsumiki's mascot uniform for the school festival stand

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The time comes for the school festival and the five decide to mount a crêpe stand (named "Tsutsumin!" meaning something like "I wrapped") together, which turns out to be a great success. Io serves as the cook but also sews Tsumiki's mascot uniform by hand, and promises the first crêpe to her. Mayoi wears no lab coat over her waitress uniform. (Source: Wikipedia)