History of Team 4:
2009/09/xx 9th generation announced
2010/12/09 At the 5th anniversary theatre performance all 9th generation members promoted to full members
2011/07/07 Team 4 formed at Minogashita 2, after the "Boku no Taiyou" performance with all 9th gen members + Nakamata Shiori and Ichikawa Miori.
2011/07/23 During Seibu Dome Day 2, Oba Mina made captain, Abe Maria and Iriyama Anna promoted from KKS to Team 4.
2011/09/02 Mori Anna graduates (official due to back pain, but she did have a scandal). Captain Oba Mina suspended due to a scandal.
2011/10/10 Team 4 1st Stage "Boku no Taiyou" shonichi. Shimada Haruka made temporary captain.
2012/01/04 Oba Mina returns from suspension, resumes as Captain.
2012/03/04 At Day 2 of Saitama Super Arena concerts, Kato Rena, Kawaei Rina, Iwata Karen, Tano Yuka, Takahashi Juri promoted to Team 4, making it 16 members.
2012/08/24 At Tokyo Dome Day 1, Team 4 was disbanded
2012/10/17 Team 4 final concert in Ibaraki as part of the 47 prefectures tour
2012/10/25 Team 4 1st Stage "Boku no Taiyou" senshuuraku
2013/01/27 Team 4's first original song "Hashire! Penguin" reaches number 1 at Request Hour
2013/05/19 Team 4 perform "Boku no Taiyou" as part of the Omoidaseru revival concert series
2013/08/24 New Team 4 announced with 13th and 14th generation members and Minegishi Minami as captain