A concept seen in Magical Girl, Mecha and Tokusatsu series where a hero or heroine faces a different monster sent after them each day.
Monster of the Week style storylines are episodic storylines that feature the hero(es) or heroine(s) within a series defeating an enemy threat within a single episode without any ongoing story development of the conflict carrying over into later episodes. The setup is normally employed for magical girl, mecha and tokusatsu anime, manga and live-action titles. Older anime and manga titles were known to utilize this type of storytelling style since many of them did not follow continual story development. Modern implementations of this storyline style are frequently utilized to build up to a larger story arc or to further flesh out aspects of the title.