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born November 16, 1991 in Tokyo is a Japanese singer, actress and a former member of the idol group AKB48, belonging to Team A. She had a recurring role on Kamen Rider W as Elizabeth, alongside group member Tomomi Itano. Together, they make up the sub-unit Queen & Elizabeth.
On November 10, 2012, it was announced she would be making her solo debut. On November 25, Kasai performed her solo song for the first time, the title announced as まさか. It was released on December 26. On December 17, Kasai announced that she would leave the group. Her farewell ceremony was on May 3, 2013.
On May 15, 2021, Kasai announced her marriage to acrobat gymnast and actor Keita Koyama. She gave birth to their first child, a daughter in 2022.
| 2006 | 1 | "Aitakatta" | A-side | Debut with Team K. |
| 2007 | 2 | "Seifuku ga Jama o Suru" | A-side | |
| 3 | "Keibetsu Shiteita Aijō" | A-side | ||
| 4 | "Bingo!" | A-side | ||
| 5 | "Boku no Taiyō" | A-side | ||
| 6 | "Yūhi o Miteiru ka?" | A-side | ||
| 2008 | 7 | "Romance, Irane" | A-side | |
| 8 | "Sakura no Hanabiratachi 2008" | A-side | ||
| 9 | "Baby! Baby! Baby!" | A-side | ||
| 10 | "Ōgoe Diamond" | A-side | ||
| 2009 | 11 | "10nen Sakura" | A-side | Also sang on "Sakurairo no Sora no Shita de" |
| 12 | "Namida Surprise!" | A-side | ||
| 13 | "Iiwake Maybe" | A-side | Ranked 10th in 2009 General Election | |
| 14 | "River" | A-side | ||
| 2010 | 15 | "Sakura no Shiori" | A-side | First single as member of Team B. Also sang on "Choose Me!" |
| 16 | "Ponytail to Shushu" | A-side | Also sang on "Majijo Teppen Blues" | |
| 17 | "Heavy Rotation" | A-side | Ranked 12th in 2010 General Election. Also sang on "Yasai Sisters". | |
| 18 | "Beginner" | A-side, Mint | Also sang on "Kimi ni Tsuite" as subgroup Mint. | |
| 19 | "Chance no Junban" | A-side | Placed 13th in rock-paper-scissors tournament. Also sang on "Yoyakushita Christmas" and "Love Jump". | |
| 2011 | 20 | "Sakura no Ki ni Narō" | A-side, Mint | Also sang on "Kiss Made 100 Mile" as Mint. |
| -- | "Dareka no Tame ni - What can I do for someone?" | -- | charity single | |
| 21 | "Everyday, Katyusha" | A-side | Also sang on "Korekara Wonderland" and "Yankee Soul". | |
| 22 | "Flying Get" | A-side | Ranked 16th in 2011 General Election. | |
| 23 | "Kaze wa Fuiteiru" | A-side | ||
| 24 | "Ue kara Mariko" | A-side | Placed in main group from rock-paper-scissors tournament; She sang on "Noël no Yoru", and on "Yobisute Fantasy" as Team B. | |
| 2012 | 25 | "Give Me Five!" | A-side (Baby Blossom), Special Girls B | Sang in chorus in Baby Blossom; she also sang on "Hitsujikai no Tabi" as Special Girls B. |
| 26 | "Manatsu no Sounds Good!" | A-side | ||
| 27 | "Gingham Check" | A-side | Ranked 12th in 2012 General Election. Her last participation in A-Side | |
| 28 | "Uza" | B-side | Sang on "Kodoku na Hoshizora" as New Team A. | |
| 29 | "Eien Pressure" | B-side | Did not place in rock-paper-scissors tournament. Sang on "Eien Yori Tsuzuku Yō ni" as OKL48. | |
| 2013 | 30 | "So Long!" | B-side | Sang on "Ruby" as Team A. Last single to participate |
| 2014 | 36 | "Labrador Retriever" | B-side | Did not participate in title song. Participated in "Kyō made no Melody" as graduated member. |
| 2016 | 19 | "Chicken Line" | B-side | Sang on "Tabi no Tochū". Participated as graduated member. |
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