Based on

Movies like Groper Train: Provocative Nasty Ass (2005)

Yuji, who has never had a girlfriend, molests Erika, an office worker, on a crowded train. Passengers on the spirit world train waiting for their turn to go to the other world are presented with the condition that they can avoid going to hell if they can make Yuji lose his virginity within a month. The ghosts desperately try to make Yuji and Erika's love come true, but...