Aoto Junko is a clumsy girl with the ability to get into trouble. One day she accidentally closes a high security bank's vault. However, this vault can only be opened once per day. To make matters worse, the weekend is coming up and it can't be opened before Monday. When all hope seems to have run out, in comes Enomoto Kei. The classic nerd type with a large interest for locks. Enomoto manages to help Aoto out once, and later on he gets chosen to help out with many cases. A locked room murder, is it really possible?
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