group's debut, the group began its seventh-anniversary tour. Berryz Kobo's 25th single "Heroine ni Narō ka!" ("Let's be Heroines") reached number one on the Oricon Daily Singles Chart for 6 March. The concert that was scheduled for 12 March in Sendai, Miyagi Prefecture, was abruptly canceled due to the 2011 Tōhoku earthquake and tsunami which hit the day before. All of the group's members were safe, but the tour had to be stopped. The concerts were either canceled or postponed until the end of March. At the end of March, Berryz Kobo released their seventh album, 7 Berryz Times. In April, the group performed at Sakura-Con 2011, an anime convention in Seattle, Washington, United States. This was the first performance by Berryz Kobo in the United States. The group participated in events such as autograph sessions, question and answer sessions, and a concert. 3,500 people were reported to have attended the concert. On 8 June, the group released their 26th single, "Ai no Dangan". On 10 August, the group released their 27th single, titled "Aa, Yo ga Akeru". 2012 In 2012, Berryz Kobo's leader Saki Shimizu announced on her official blog that on 21 March, the new Berryz Kobo single "Be Genki! (Naseba Naru)" would be released. The group's eighth album Ai no Album 8 was released on 22 February. On 8–10 June, the group appeared at AnimeNEXT in Somerset, New Jersey, their second live performance in USA. On 20 June, the group released its second collaboration CD single with fellow Hello! Project Kids group Cute, named "Chō Happy Song" ("Super Happy Song.") The title tune is an overlay of two previously published songs, Berryz Kobo's "Because Happiness" and Cute's "Shiawase no Tochū" ("On the Road to Happiness") from their 2012 albums, which were composed and produced by Tsunku intentionally to form a new song when played simultaneously. The trick was originally scheduled to be announced at a summer Hello! Project concert, but was uncovered by fans in mid-April. The song became widely discussed on the Internet, and the set of three tracks, "Because Happiness", "Shiawase no Tochū", and "Chō Happy Song", was hastily released as a digital download single on 28 April. On 25 July, the group released their 29th single, "Cha Cha Sing," a cover song of the popular Thai song "Row Mah Sing" by artist Thongchai McIntyre. The single was the group's first to include a solo