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.

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