One day, Kouki, a researcher who was overworked, found an unconscious "dog" at his apartment complex. Feeling compassionate, he brought it home with him. The next morning, when Kouki woke up, he saw an unfamiliar man in his apartment. Panicked, he thought the man might be a burglar. However, to his surprise, the man transformed into the "dog" that Kouki had saved the previous day and started talking. The dog thanked Kouki for being kind and they began living together as owner and pet in their shared apartment. This is a heartwarming tale about the friendship between a human-transforming dog and a scientist under one roof.