[J-Cup Reverse Bunny Girl Defiled by 10 Gangbang Cumshots!] A crowded train on the way to a Halloween party. Kozuru, a normally timid and reserved college student, is invited by her outgoing friend to wear a revealing cosplay outfit, almost forcibly. The atmosphere is open and different from usual... In a carriage filled with rowdy young people, a little physical contact goes unnoticed... Kozuru's sexy costume is discovered and she becomes the target of a molester, but no one comes to her rescue, and she is gang-raped as much as they want by a group of men who join in on the fun...