as its principal thematic element. Yui's upcoming single was announced through her participation in Ncon (Nコン), a national school music competition where schools compete to provide their best rendition of songs composed by select artists for a specific theme for that year. Yui was selected to compose for the middle school category. The song was eventually revealed as "fight" on R no Housoku (Rの法則), and was released on September 5, 2012. In a video uploaded to Yui's official Vevo channel on December 18, 2012, she announced that she would be taking a break from music. She explained that "...Yui is so precious and special for me, so I want to leave it as is for a while." To her fans, she said, "Actually, part of the reason I'm going into hiatus again is for the sake of my fans. The biggest reason is that I don't want them to see me with a broken-off heart, if that happens." Flower Flower (2013–present) Yui returned from hiatus shortly thereafter with a new band called Flower Flower, which performed incognito throughout Japan. The band has since released four digital and Japan-only singles; "Tsuki (月)," "Kamisama (神様)," "Natsu/Aki (夏/秋)" and "Subarashii Sekai (素晴らしい世界)". On March 27, 2014, Yui revealed in her band blog that she had been diagnosed with a panic disorder, which resulted in the cancellation of some presentations. The band, however, would release its first studio album Mi (実) on November 26, 2014. The album would go on to debut at number 5 on the weekly Oricon, charting for 11 weeks. On April 17, 2015, the singer announced via the official blog of her band Flower Flower that she had married a man outside of the industry and that she was pregnant. In August 2015, it was announced that Yui had given birth to healthy twin boys. Flower Flower released the band's first physical single, "Takaramono (宝物)," on September 9, 2016, which debuted at number ten and charted for five weeks. While talking about the release of the single, almost a year and a half after her previous project, Yui would state: "I did not think I could release songs again, and to be honest I am quite happy that I can." In the summer of 2017, Flower Flower appeared in various festivals, including at Rock in Japan Festival 2017 and Summer Sonic 2017, leading to speculation that the band would release