掟上今日子の乗車券

The eleventh instalment of the Boukyaku Tantei Series. Okitegami Kyouko—her memory resets every time she sleeps. Taking advantage of this characteristic, she works as the "forgetful detective". In the name of business, she sets out on a trip with her bodyguard, Oyagiri Mamoru. She has no particular destination in mind. What kind of incident awaits them on this trip? (Source: Kodansha, translated)