Yokoyama Yui (横山由依), nickname "Yuihan" (ゆいはん), born December 8, 1992 in Kyoto, Japan is a Japanese idol singer and actress, as well as captain of idol group AKB48's Team A. She is also a member of the sub-unit Not yet. Yokoyama failed SKE48's 2nd generation auditions but passed AKB48's 6th round of auditions for the 9th generation Research Students on September 20, 2009. Yokoyama was the first 9th generation Research Student to be promoted at AKB48 Tokyo Matsuri on October 10, 2010.

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