Aizuki works as an ordinary office lady in Tokyo during the day. However, even though she is an ordinary office lady, during busy periods, she endures a continuous string of unpaid overtime, wearing down her spirit more than her body. Thus, she plans to go on a solo mountain climb, her one and only hobby. She hopes it will be at a place she's never been before, so she gathers information using SNS and decides on the mountain to climb. However, upon actually going there, she finds that even experienced climbers can easily get lost on this 'mountain of bewilderment'... Naturally, Aizuki also gets lost, but she manages to reach a certain mountain lodge and escapes her predicament. But tragedy begins from there... Since close to the time they entered the mountain, a servant with clear ulterior motives has been following her all along. And in this secluded mountain lodge... The servant starts preparing for his long-planned perfect crime of restraint and training.
