While settling into married life with Akiko, Ryu is brought into a case involving a woman named Katsuragi Aoi, a member of a pickpocketing ring with most of her teammates murdered from unknown masked vigilantes that Ryu fought as Accel. As the details of the case begin to unravel, Ryu is framed and Akiko believes that he may not be faithful to her. As the clock ticks down, Ryu must solve the case, clear his name, and save his marriage before everything comes to an explosive end!

35岁的铃原奈绪（松雪泰子 饰）只身漂泊北国。似乎因某种原因，在过去的10年里她从未回到家中。奈绪喜欢观察鸟类，却阴差阳错成为一名小学教员。在此期间，她邂逅了7岁的小女孩道木怜南（芦田爱菜 饰）。怜南想法独特，性格开朗，只是身边没有一个朋友。她生长在单亲的家庭里，母亲和 情人同居，过着寥落破败的生活。怜南的特立独行和其身上偶然发现的伤痕引起奈绪和校方的注意。他们意识到这个小女孩正遭受来自母亲的虐待，几经波折，奈绪的母性被唤起。她决定“诱拐”怜南，担当起作为母亲的责任。
那个飘雪的日子，奈绪和怜南乔装打扮，相约离开寒冷的北国，启程去寻找一个温馨幸福的家园……