 Toyosaki 's first musical performance was with fellow voice actress Eri Kitamura on the Minami @-@ ke Weather ( <unk> <unk> , Minami @-@ ke <unk> ) image song CD on April 23 , 2008 . She then performed the opening and ending themes of the 2009 anime series K @-@ On ! , " <unk> ! Girls " and " Don 't say ' lazy ' " respectively , with voice actresses Yōko Hikasa , Satomi Satō , and Minako Kotobuki . Both themes were released as singles on April 22 , 2009 . The " <unk> ! Girls " single sold about 62 @,@ 000 copies during its debut week , ranking fourth on Oricon 's latest weekly singles chart , while the " Don 't say ' lazy ' " single sold about 67 @,@ 000 copies during its debut week , placing second on the chart . The opening and ending singles remained on the chart during the week of April 27 to May 3 , falling to sixth and fifth , while selling an additional 19 @,@ 963 and 22 @,@ 094 copies . On June 23 , 2009 , " Don 't say ' lazy ' " was awarded Animation Kobe 's " Best Song " award . 
