Question: Haruka Shimazaki was a member of which Japanese idol girl group that is produced by Yasushi Akimoto?
Context: SKE48 (S.K.E. Forty-eight) is a Japanese idol girl group produced by Yasushi Akimoto.  The group performs at SKE48 Theater on 2F of Sunshine Sakae in Sakae, Nagoya.  Avex Group is its current official label. AKB48 (pronounced "A.K.B. Forty-eight") is a Japanese idol girl group named after the Akihabara ("Akiba" for short) area in Tokyo, where the group's theater is located.  The group has expanded since then to include over 130 members as of 2015 , aged from their early teens to their mid-20s.  AKB48's producer, Yasushi Akimoto, wanted to form a girl group with its own theater (unlike pop groups performing occasional concerts and seen on television) and performing daily so fans could always see them live.  This "idols you can meet" concept includes teams which can rotate performances and perform simultaneously at several events and "handshake" events, where fans can meet group members.  Akimoto has expanded the AKB48 concept to several sister groups in China, Japan and Indonesia, with upcoming groups announced for the Philippines, Taiwan and Thailand. NMB48 (read "N.M.B. Forty-eight") is a Japanese idol girl group that debuted in 2011 as the second sister group to AKB48, produced by Yasushi Akimoto.  The group performs at the NMB48 Theater which is located in the basement of the Yes-Namba Building in Namba, Osaka.  The name "NMB" comes from "Namba" in the Minami district in Osaka. Haruka Shimazaki (島崎 遥香 , Shimazaki Haruka , born March 30, 1994 in Saitama Prefecture) is a Japanese singer and actress, former member of the Japanese idol group AKB48.  She was in Team A. However, she graduated from the group in 2016. NGT48 (read "N.G.T. Forty-eight") is a Japanese idol girl group formed in October 2015 in Niigata produced by Yasushi Akimoto.  The group performs at the NGT48 Theater which is located in the fourth floor of the LoveLa2 shopping mall in Niigata city. SDN48 (read "S.D.N. Forty-eight", short for Saturday Night 48) was a Japanese idol girl group, created and produced by Yasushi Akimoto.  SDN48 was created based on an "adult idol" concept.  Former AKB48 member Kayo Noro was chosen as the captain of the group.  In November 2010, the group made their major label debut with "Gagaga".  The group ended with a farewell concert on March 31, 2012. HKT48 (read "H.K.T. Forty-eight") is a Japanese idol girl group produced by Yasushi Akimoto.  The group currently performs at HKT48 Theater at Nishitetsu Hall in Fukuoka from April 28, 2016. Haruka Katayama (片山 陽加 , Katayama Haruka , born 10 May 1990, in Aichi Prefecture, Japan) , is a Japanese actress and "tarento" who is a former member of the idol group AKB48's team A produced by Yasushi Akimoto.  She debuted in 2007 with team B, joined team A in 2010, and returned to team B in 2012. Minami Takahashi (高橋 みなみ , Takahashi Minami , born April 8, 1991 in Tokyo) is a former member of the Japanese idol girl group AKB48 under Team A.  She is the former General Director (総監督 , sōkantoku ) of AKB48 and its sister groups.  In an interview with Nippon Television in June 2010, AKB48 producer Yasushi Akimoto described her as the "eldest daughter of the 48 sisters".  She is commonly part of the main lineup for the AKB48 singles.  She is a member of the AKB48 sub-group no3b, along with AKB48 member Minami Minegishi and ex-member Haruna Kojima. High Tension (ハイテンション ) is the 46th single by Japanese idol girl group AKB48.  It was released on  16, 2016 (2016--) through You, Be Cool! /King Records.  This is the final single appearance of Haruka Shimazaki, who left the group shortly after the release.  The single's choreography is also centered by Shimazaki.  The title song is used as the theme song of their drama "Cabasuka Gakuen" premiered on October 30, 2016.
Answer: AKB48