Additionally, Kawamoto was promoted as a vocalist and sung the B-side "Love Letter", marking her the first E-girls member to change positions.[12] On 17 April, the girls promoted their debut record Lesson 1, which sold numerous units on the Oricon Albums Chart, debuting at number one and charted over 70 non-consecutive weeks.[13] This was the final effort by EGD member Reina Kizu, whom left the group some months later; her position was replaced officially by Nakajima.[14]