 On April 26, 2007, it was announced that her contract would be transferred to Horipro.Upon joining the new talent agency, she was put on the roster of Xanadu loves NHC, a futsal team consisting of idols from Horipro; her jersey number was 18.Oshima made her first appearance on "Kouhaku Uta Gassen", an annual music show where the most successful artists compete, with AKB48 on December 31, 2007.