A blindfolded female college student takes on a dick-shaped dildo challenge, carefully savoring the "shape" and "feel" of each dildo to determine which one is correct. If she guesses right, she wins a cash prize, but the moment she fails, a punishment game of getting instantly fucked by a big dick awaits. This time, the challenger is "Momoka," a modern girl who belongs to a light music club. It's her first time trying the dildo challenge, and while she's a bit hesitant at first, she eagerly inserts the dildos for the sake of the prize. However, as she goes through more rounds, pleasure takes over, and she starts squirting repeatedly. Her vaginal juices overflow, quickly forming a puddle. By now, it's less of a dildo challenge and more of a full-on masturbation session as "Momoka" gets incredibly turned on. Will she manage to win the cash prize?