 Following the success of her single " Hajimete No Dekigoto " , the song " Hitori <unk> " ( Walking Alone ) ( which was the theme song for her first ever movie production " Spoon Ippai No Shiawase " ( Spoonful of Happiness ) was released in March 1975 and peaked at number 4 , grossing over 350 @,@ 000 copies . She was the best selling Japanese female musical artist of 1975 , and 4th best selling of 1976 . In the summer of 1975 the single " <unk> No Natsu " ( Seventeen Summers ) was released , and became her second best selling single ; grossing over 404 @,@ 000 copies and peaking at number 2 on the Oricon charts . At the 17th edition of the Japan Record Awards " <unk> No Natsu " won her the award for most popular artist voted by the public . In the fall of the same year she was awarded at the 6th edition of the Japan Music Awards for her single " Tenshi No Kuchibiru " ( Lips of an Angel ) , which sold over 281 @,@ 000 copies and peaked at number 4 on the charts . 
