From Yen On:
Mahiru is a beautiful girl whose classmates all call her an “angel.” Not only is she a star athlete with perfect grades-she’s also drop-dead gorgeous. Amane‚ an average guy and self-admitted slob‚ has never thought much of the divine beauty‚ despite attending the same school. Everything changes when he happens to see Mahiru sitting alone in a park during a rainstorm. Thus begins the strange relationship between this incredibly unlikely pair.