Working as an apartment manager, busy with daily duties, one day the intercom at the management office rang—an unusual occurrence. Opening the door, he found Lala-chan, the daughter of Mr. Kudo from unit 501, standing there. She looked up at him with tearful eyes, explaining she had forgotten her key and couldn't get into her apartment. Hurrying over to her place, he discovered there was no spare key or contact information available. Lala-chan grew more anxious, whispering, "Manager-san... I really need to use the bathroom..."—tension mounting by the second.