spring, and that Momoka Ariyasu had to undergo a throat treatment and she would not sing or even talk until the end of January. The treatment was subsequently prolonged for another month, until the end of February. During the group's live Ustream broadcasts, Momoka communicated by drawing and writing on a markerboard. At live performances, other members took turns in singing her parts. 2013: 5th Dimension Momoiro Clover Z's second full-length album 5th Dimension was released in April. It sold 180,000 copies in the first week and debuted on top of the Oricon charts, with the first album Battle and Romance resurging to number two. Finally, it won a platinum disk award. In August, Momoiro Clover Z held a concert at Nissan Stadium. It has the largest capacity in Japan. 2014: Dream come true In March, the group held a solo concert at National Olympic Stadium, realizing one of their dreams since the debut. Such solo concerts had only been performed by six groups until then. Momoiro Clover Z was the first female group and also became the fastest group ever, which achieved that in six years. As a two-day concert, a total of 150,000 people watched in the stadium and at live viewing venues. In May, the group released their 11th single "Naite mo Iin Da yo"; B-side "My Dear Fellow" made its debut at Yankee Stadium when it was used for Masahiro Tanaka's warm up for his first game with the New York Yankees. The group also provided the theme music for the anime Sailor Moon Crystal. The title is "Moon Pride" (the group's 12th single released in July). In August, the group performed at Lady Gaga's concert as an opening act. It was a part of Gaga's world tour named "ArtRave: The Artpop Ball" and held in Japan. Momoiro Clover Z was selected by Gaga herself. 2015: Collaboration with KISS On January 28, 2015, Momoiro Clover Z released a collaboration single with the American hard rock band KISS, titled "Yume no Ukiyo ni Saitemina". It was the first time for KISS to release a collaboration CD with another artist. In Japan, it was released physically in two versions: Momoiro Clover Z edition (CD+Blu-ray) and KISS edition (CD only). An alternate mix of the single's title song was also included as an opening track on the Japanese-only SHM-CD album Best of KISS 40, released in Japan on the