no Waku Waku Best". The former featured the single "Massugu", while latter featured a new song, titled "Sudden Death". All songs released prior to "Butterfly Effect" have been re-recorded with Kobayashi and Nakayama. In December, Ebichu performed two consecutive nights at Yoyogi Dai-ichi Taiikukan, where Kobayashi and Kashiwagi returned to regular performing. Ebicracy (2017–2018) On February 8, 2017, Rina Matsuno died, aged 18. Matsuno was unable to perform at the group's concert the previous day due to feeling ill, and was resting at home in Tokyo. In the early morning on February 8 her condition suddenly worsened. At around 5 AM her parents called 119. She was taken in the ambulance, but pronounced dead at the hospital. On February 10, it was revealed that the cause of death was a cardiac arrhythmia. In her last post on Instagram on February 6 she said that she had returned from a family trip to Hakone. All upcoming concerts and events were cancelled, and the group went into a period of mourning. The group's website continued listing Rina Matsuno as a member until April 1. It was then announced that the group would continue on with the remaining 7 members, and that a new album, titled "Ebicracy", would be released on May 31. The new album is the first Ebichu album to not feature any singles, consisting only of new material. "Ebicracy" charted at number 1 on both the Oricon and Billboard Japan weekly album charts, a first for Ebichu. In support of the album, Ebichu embarked on a tour titled "Shiritsu Ebisu Chugaku IDOL march HALLTOUR 2017 ~Ima, Kimi to Koko ni Iru~", from April 22 to July 16. The last day of the tour, July 16, was Matsuno's birthday. After the show ended, an "end credits" video was played on screen, accompanied by a Rina Matsuno solo version of the song "Kanjou Densha", from "Ebicracy". This was possible because work on "Kanjou Densha" had begun earlier than the other songs, due to it being used in a commercial. The fifth installment of the "Famien" summer concerts took place on August 26. On August 31, Aika Hirota announced that she will be withdrawing from the group following a final concert on January 3, 2018. On September 23, Ebichu performed a special autumn concert titled "Chūon", which has the audience remain seated, and features a live backing band. The members of Ebichu don't