 The new four-member group Bis made its debut on the indie record label Tsubasa Records with the free digital single, "Taiyou no Jumon" (太陽のじゅもん).Then, in March 2011, they released the album "Brand-new idol Society", which included "Taiyou no Jumon" and a cover of "One day", a song originally by Pour Lui.After the release of "Brand-new idol Society", Rina Yokoyama left the group due to a disagreement over the increasingly "un-idol" like direction the group was taking.