The story takes place in Britain during World War II. Tom Jericho is an excellent password-breaking expert who works at the Blancheli Park password-cracking Center to help the allies crack the code code "riddle". Here, he had a brief and passionate relationship with a female employee, Claire Romilly. Clare is a beautiful but mysterious woman who seems to have a lot of secrets hidden in her. In spite of this, she attracted a large number of pursuers in the decoding center, and Tom was just one of them. For his part, Tom has not enjoyed the joys of life and the sweetness of love since the war broke out five years ago, so he soon became infatuated with Claire. However, it was obvious that Claire was not committed, and she soon got bored and proposed to break up and fall in love with someone else. Tom suddenly collapsed and was absent-minded at work. This frustration and pain was finally inspired by the arrogant boss, who beat him up impulsively. This move led to his transfer, but a month later, he was transferred back to the center. At this time, Blancheli Park is in chaos, facing a disaster.
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