第 15 集: 在姐妹競爭中，Mahiru Kasumi 被選中參加美貌班能力測試

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An implementation for a proficiency test has been announced for the first years. Furthermore, one student from each class will be selected to participate in the Summer Festival as a unit with S4. Test results of their abilities came back and Mahiru Kasumi is the first to be selected for the Beauty Class. Everyone thought she would be happy but her facial expression is firm, saying "I will definitely not lose to my sister"... (Source: Aikatsu Stars! Wiki, edited)