Kyoko Okitegami is known as the Forgetful Private Detective. When she wakes up in the morning, her memory is reset. Because of her condition, she has to solve every case just in a day.

Kyoko Okitegami is a private detective. She is known as the Forgetful Private Detective. When she wakes up in the morning, her memory is reset. Due to this, she rigidly adheres to a maintenance secret. No matter what case she has, she has to solve the case in a day. On her body, she has an important note that she must never forget. Even though Yakusuke Kakushidate has a crush on Kyoko Okitegami, he is alway mistaken as the culprit of a case by Kyoko Okitegami. No matter how close Yakusuke Kakushidate gets to Kyoko Okitegami, she totally forgets about him by the next day.