Wasurenagumo

Long ago, a Spider Yokai killed a lot of people; but a brave monk challenged her.

In modern day; a young used bookseller (Suzuri) and his landlord's granddaughter (Mizuki) crack a sealed book that had an offspring of that spider. The spider takes the form of young innocent child; and they take care of her.

A heartwarming tale. Or not.

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This series has examples of:

• Adorable Abomination
• Cute Monster Girl: Horribly subverted; the cute appearance is an act; and she ultimately sacrifices Mizuki to her mother and shapeshifts into her.
• Giant Spider
• History Repeats: The same events happened to the monk. The current day cast even read about it.
• I'm taking her home with me!
• Nature Versus Nurture
• Yokai