The AV debut of Riku Minato, a college student working at a mahjong parlor, is full of surprises right from the first shoot! She goes into the parlor without an appointment, fingering the customers where they can't see, forcing them to serve her without panties, and challenging them to a mahjong match with a 3P shoot as the prize. She is attacked in every way possible in a situation where she can't make a sound, and it's adorable to see her desperately trying to hold back her moans.