Osananajimi ni Kokuhaku Shitai Shougakusei ga 1-wa-goto ni Utsukushiku Seichou Shiteiku Hanashi.

Alternative

幼馴染に告白したい小学生が1話ごとに美しく成長していく話; Osananajimi ni Kokuhaku Shitai Shougakusei ga 1-wa-goto ni Utsukushiku Seichou Shiteiku Hanashi.; A Story About an Elementary School Student Who Wants to Confess His Feelings to His Childhood Friend While Growing Up Beautifully Each Chapter.