推理作家「M」尋找在萬聖節的晚上消失的戀人的同時，與各種奇妙的人陸續相遇。最後 M 將迫近女朋友失蹤真相的核心，迎來意想不到的事態。

Makoto, who doesn't get along with her boyfriend, family, or friends, goes camping with a childhood friend she meets again, but... "We're just bored," Makoto murmurs, and the way she lightly and deeply empathizes with her overwhelmed heart is exquisite.

Freelance proofreader Fuyuko's carefully ordered life in solitude begins to transform after meeting Mitsutsuka, a quiet high school physics teacher.

Midori Mantani and Masao Minamisawa are both 28-years-old. They have dated for 4 years, but their relationship seems to be just going through the motions. They think about breaking up. At that time, Midori becomes pregnant. Midori and Masao decide to marry. While preparing for their wedding, they become more familiar with each other's background. Midori Mantani grew up with parents who ran an iron factory in a provincial city that didn't offer much in terms of culture. Unlike Midori, Masao Minamisawa grew up in Tokyo and his family was wealthy. His father worked as a photographer and his mother was a doctor. He now works as a web designer. The couple begin to have a better understanding of each other.

2021 film directed by Yukiko Sode