Saikawa Rai was known as the Goddess of Luck throughout her school and nobody knew what the source of her luck was. Hanabusa Mitsuru confesses his love to her and finds out the source of her luck… Dice. [Wikipedia](https://ja.wikipedia.org/wiki/PARA%E2%98%85%E3%83%80%E3%82%A4%E3%82%B9)