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Kimura Yui has had a tragic life. After the traumatic death of her parents, Kimura has suffered yet another loss: her personal advisor, Kansaki. Now, lonely and distressed, Kimura wanders in the rain until she is harassed by two suspicious men – and subsequently is saved by an unknown benefactor while she faints and falls to the ground. Later, Kimura awakens in the house of her savior, the detective Takamizawa Kyosuke, who offers to help her discover the truth behind these murders…
Inspector Cat, Detective Kun-Kun, Madam Rabbit and the rest of the gang are dishing it up at a dinner party one evening, chatting and admiring Madam Rabbit's newest gift: a gorgeous Blue Tiara! However, things take a turn for the worse when the lights go out, for Madam Rabbit's treasure is stolen! Now, Detective Kun-Kun and Inspector Cat must put on their thinking caps and catch the culprit - the mysterious Cat Thief!