A company of friends rises in the funicular to meet unforgettably New Year's Eve on the top of the mountain. The guys are already anticipating how they will cheerfully slide down to the beat of the chimes and explosions of fireworks. But the adventure turns into a real nightmare, when in the midst of the holiday a flimsy trailer gets stuck over the precipice.。大伴恭一(大仓忠义饰),从学生时代起就只与“喜爱自己的女性”交往,不断重复着被动的恋爱,也因为优柔寡断的性格而不断地出轨。大学后辈今之濑涉(成田凌饰)作为出轨调查员在接受主人公妻子的委托后,某日与前辈大伴恭一时隔7年再次相遇,突然向其告白「从很早以前就一直喜欢你了」,并用为其隐瞒出轨事实作为代价要求前辈以身体来交换。在被今之濑死缠烂打地靠近和追求下,最终恭一也体会到了如胸口揪心般的恋爱之痛…。