College student Rio is in a relationship with photographer Tomoya. At Rio's university, there is a famous math lecturer named Sakurada who incorporates practical pachinko slot machine play into his classes. Rio plays pachinko slots for the first time in class and shows glimpses of her talent. Rio plays pachinko slots on a date with Tomoya, who is taking pictures instead of playing. Wandering around the store, Tomoya accidentally photographs a group of people setting up a cheating scheme. Tomoya is chased and kidnapped by the group of cheats. And Rio, who has the photographic evidence of the cheating, is also in danger!