Miroku-san, the slit-mouth woman, is to marry high school student Kouichi to maintain her existence as his family has been in charge of upkeeping superstitions for generations. To add, there seems to be another reason that he seems more than willing...

Miroku, however, would rather use her own strength than borrow that of others. Thus, they establish a contract as follows.
1. For a trial period of a year, they are to act as though they were married.
2. If she is able to scare him within that year, the engagement will be broken.

A slit-mouth woman encounters a young boy she's unable to scare.

Higurashi Tsugumi lost his parents and maidservant in a fire when he was still young. He's now 15 and a promising new writer, however, he's been stuck in a slump for the past year. He decides to go back to his old family home in order to gain inspiration by reminiscing on his happy past. Unbeknownst to him, he would be greeted with an unexpected surprise from his childhood...

A slit mouth woman, also known as Kuchisake Onna. The winning prize to the 29th Young Gangan Manga awards!