SDMU-645 Magic Mirror Cruise: College students tipsy from cherry blossom viewing attempt the '500 hip thrusts, hold back penetration for ¥1 million!' lube-only sex game... but end up with raw penetration and actual internal ejaculation!

Approaching a group of tipsy modern college students at a cherry blossom viewing event, inviting them to participate in the '500-piston insertion challenge' with a lubricated sex game: if you can hold back from penetration for 500 times, you win a prize of 1 million yen. Can these inexperienced female college students who don't even know how to do frottage and drunk male college students who have lost their reason really manage to hold back from penetration and keep thrusting?