Even with her mouth slit open, Miroku-san—the infamous slit-mouth woman—must marry high school student Kouichi to sustain her existence. His family has been responsible for maintaining supernatural traditions for generations, and strangely, Kouichi doesn’t seem entirely opposed to the idea. But Miroku refuses to rely on others, preferring her own strength. So they strike a deal:
1. For one year, they’ll pretend to be married.
2. If she can frighten him within that time, the engagement is off.
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