https://myanimelist.net/manga/100448/Jumyou_wo_Kaitotte_Moratta_Ichinen_ni_Tsuki_Ichimanen_de Also known as "I sold my life for ten thousand yen per year." & "Three Days of Happiness" Probably my favorite manga of all time I didn't come across a good download link or torrent so I made one myself. The extra chapter is included. "Jumyou wo Kaitotte Moratta. Ichinen ni Tsuki, Ichimanen de. focuses on a twenty-year-old with little hope for the future. One day, he discovers a shop that buys lifespan, time, and health. This is a story dealing with the consequences of doing so."