In the apartment where Natsumi lives, the concierge is a presence that cannot be ignored.He usually ensures the comfort and safety of each resident with his professional and attentive service.However, at a certain critical moment, his absence became an intractable mystery.

When Akiko and her accomplices were conducting secret investigations around Natsumi's house, the concierge took decisive action and asked them to leave the apartment area on the grounds that they might cause inconvenience to other residents of the apartment.His move not only reflects his professionalism, but also demonstrates his sense of responsibility to the residents of the apartment.

However, on the night when Akiko and others decided to implement the invasion plan, the concierge unexpectedly did not appear in the apartment lobby.This unusual situation is not only puzzling, but also makes people question the safety of the apartment.Why is the concierge absent at such a critical moment?

Perhaps he was forced to leave his post due to some unexpected situation.Perhaps he encountered an accident or received some kind of threat that prevented him from performing his duties.Or perhaps, he had his own secret, and that night was the moment when he performed another unknown mission.

Regardless of the reason, the absence of the concierge undoubtedly provided an opportunity for Akiko and others' invasion plan.However, this also creates hidden dangers for the safety of the apartment.This incident is not only a severe test for apartment management, but also makes people begin to re-examine the safety measures of apartments and the importance of concierges.