Aikatsu Stars! Episode 15 English Subbed Episode Title:Tsuki to Taiyō.Episode Description: As the top scorers of their respective classes, Rola, Ako, and Mahiru, along with the Dance Class' Luka Haruka, are chosen to pair up with the S4 members and compete in a Summer Fest tournament with lunch coupons up for grabs. Partnered up with Yozora, Mahiru starts to lose her confidence when she sees how good Yozora is. She then explains to Yume and the others how she felt abandoned when Yozora left for Yottsuboshi Academy, which led to her wanting to surpass her. Wanting to surpass Yozora in her performance, Mahiru overworks herself training and ends up collapsing. She becomes further downhearted after Yozora slaps her for acting selfish, wanting to drop out of the Summer Fest. As Koharu helps Mahiru realise that she is actually feeling lonely, Yozora, upon speaking with Hime, shows Mahiru a drawing she had kept from her, revealing she had always been looking forward to spending time together again. Making up with each other, Mahiru and Yozora give a stunning performance at the Summer Fest.