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Three Days of Happiness
	Cover of the novel
三日間の幸福; (Mikkakan no kōfuku)
Genre	Drama; Romance; Supernatural;
Novel
Written by	Sugaru Miaki
Illustrated by	E9L
Published by	ASCII Media Works
English publisher	NA: Yen Press;
Imprint	Media Works Bunko
Demographic	Male
Published	December 25, 2013
Manga
Jumyō o Kaitotte Moratta. Ichinen ni Tsuki, Ichimanen de
Written by	Sugaru Miaki
Illustrated by	Shōichi Taguchi
Published by	Shueisha
Imprint	Jump Comics+
Magazine	Shōnen Jump+
Demographic	Shōnen
Original run	August 10, 2016 – October 25, 2017
Volumes	3

Three Days of Happiness (三日間の幸福, Mikkakan no kōfuku) is a Japanese novel written by Sugaru Miaki and illustrated by E9L. It was published by ASCII Media Works in December 2013. The novel received a manga adaptation titled I Sold My Life for Ten Thousand Yen Per Year (寿命を買い取ってもらった。一年につき、一万円で。, Jumyō o Kaitotte Moratta. Ichinen ni Tsuki, Ichimanen de.) illustrated by Shōichi Taguchi and published by Shueisha on their Shōnen Jump+ platform, and then released in three tankōbon volumes.

Plot

Unable to make ends meet in Japan with his part-time job, 20 year old Kusunoki prepares to sell the last of his possessions. After visiting a library to sell books, the clerk tells Kusunoki of a place where he can sell his lifespan for money. Everything between how impactful someone is to the world and how many people they have affected determine the price of their lifespan. Curious, Kusunoki decides to see the place. There, he meets a mysterious clerk, a girl named Miyagi. Miyagi informs him that Kusunoki's entire lifespan is only worth ¥300,000 (about $3000), abysmally lower than the average. Realizing that his future is worthless, Kusunoki sells his lifespan, keeping only 3 months so that he may enjoy the money. The next day, he awakens to Miyagi knocking on his door. As a policy of the company, she was sent to watch over Kusunoki for the next 3 months until his death. With the money he acquired and only 3 more months to live, Kusunoki seeks to amend his hopeless life under Miyagi's watch.

Characters

Kusunoki: A 20 year old man in a dire life and financial situation, who sells his 30 year long lifespan for ¥300,000.
Miyagi: A young woman who is a clerk from the lifespan store who becomes Kusunoki's observer over the next three months.
Himeno: Kusunoki's childhood friend whom he had feelings for.

Media

Novel

Written by Sugaru Miaki and illustrated by E9L, Three Days of Happiness was published in a single volume by ASCII Media Works under their Media Works Bunko imprint on December 25, 2013.^[2]^[3]

The novel was licensed for English release in North America by Yen Press;^[4] it was released on October 20, 2020.^[5]

Manga

A manga adaptation of the novel written by Sugaru Miaki and illustrated by Shōichi Taguchi was serialized on Shueisha's website and app Shōnen Jump+ from August 10, 2016^[6] to October 25, 2017.^[7] Shueisha collected its chapters in three tankōbon volumes, released from July 4 to December 4, 2017.^[8]^[9]