Yozora announces a contest for students to design their own dress for Romance Kiss and wear it in a special performance. While exploring town for ideas, Yume, Rola, and Koharu come across both Yozora and M4's Asahi, who are both revealed to be Mahiru's siblings. While observing their interactions, Koharu notices that Mahiru always seems to feel downhearted when compared to her sister. Later, Mahiru wins the design contest, having used an alias to both avoid favoritism and to challenge Yozora, who she feels she cannot match up to. On the day of the performance, Yume and the others bring Mahiru a cake to make her smile, something she had been forgetting to do lately, helping her performance shine even more. Afterwards, Mahiru puts up a Tanabata slip, stating her determination to surpass Yozora one day.