Replacing the historical drama "Mito Komon" in its Monday evening slot is a much different type of series, a "humorous mystery" called "Stepfather Step" (TBS, 8 p.m.), based on a novel by Miyuki Miyabe.
A professional thief (Takaya Kamikawa) steals only from people who have come by their wealth unethically. While breaking into a house he gets into a difficult situation and is saved by a pair of elementary school-age twins who live next door. The brothers, it turns out, live alone, their parents having just run off with their respective lovers, and they talk the thief into pretending to be their stepfather.
In episode four, the twins' teacher, Reiko (Manami Konishi), figures out the thief is not their stepfather, and he decides to go back to his old life. When the twins find a stray dog on their way home from school, they locate the thief at the lawyer's office where he usually sleeps and ask him for permission to keep the dog.