故事发生在一个叫Sakura Shin的小镇上，那里的人类和怪物打着和平的幌子生活在一起。然而，盛开的樱花带来了危机的预兆，越来越多的怪物出现在这里，人类和怪物的世界也开始融合。为了应对这场危机，“碧泉生命咨询公司”的成员挺身而出。
An affluent medical professor, Komiya, and his bossy wife, Tokio, are to look after Setsuko, their high-spirited niece from Osaka. Setsuko is a liberated woman who does what she wants, including smoking, even though she is a minor. On Saturday, the professor does not feel like going to his weekend golf game, but his wife packs him off anyway. So he leaves his bag at the apartment of his student Okada, and goes to a bar with a friend. Setsuko traces him there, and insists that he take her to a geisha house. When she gets rather tipsy, the professor calls Okada to take her home, while he sleeps at Okada's. The wife becomes suspicious of Setsuko when she sees Okada bringing her home, and also of her husband when she discovers that he did not go golfing.
