At an exclusive boys' school, a new gym teacher is drawn into a feud between two older instructors, and he discovers that everything at the school is not quite as staid, tranquil and harmless as it seems.
大学教授渡边退休后独居小屋，每日煮饭、操持家务，在日复一日的淡雅日常中，打点自身晚年生活。专注追求学识的极致，偶有红粉知己探访。写作之余也撰写遗嘱，受邀演讲还是坚持自己的价码。如此尊严又惬意自在的状态，却逐渐浮现健康恶化、关系崩解等征兆。心绪混乱的同时，渡边开始不断收到同一则诡谲的信息：逃跑吧，北方的敌人即将来到⋯⋯
