The Secret Spell Is the Beginning of the Rainy Season/The Spell of Relativity Is Tanabata, The Star Festival - S1.E4

A. During the rainy season, Aiko's systems are covered in mildew making her voice sound bad. While Liru is playing in the rain, Uma and Pachira try to clean Aiko's systems upon deactivating her.

B. A heat wave has struck Hikarigaoka and the girls learn that Tanabata occurs on the 7th of July while deciding what wish should be granted by it.