Read Manga Jumyou wo Kaitotte Moratta. Ichinen ni Tsuki, Ichimanen de online in English. Also known as Three Days of Happiness, I Sold My Life for Ten Thousand Yen per Year, and Mikkakan no Koufuku.

Kusunoki once believed he was destined for something remarkable, but by twenty he has settled into a hollow routine of mediocrity, debt, and isolation. Out of options and desperate for cash, he follows a rumor to a shop that deals in an impossible currency: lifespan. The appraisal is brutal. His entire remaining existence is only worth a few hundred thousand yen. He sells thirty years, pocketing a mere ten thousand yen for each one, and walks out with just three months left to breathe.

The moment he returns home, the girl who handled his transaction appears at his door. Miyagi is not there to save him. Her sole purpose is to observe him for the next three months so that his final seventy-two hours can unfold without interference. What begins as a transaction of despair slowly becomes something far more complicated. The clock ticks down, old wounds reopen, and Kusunoki must face every dream he abandoned and every person he pushed away. The line between a life already thrown away and one worth fighting for grows unbearably thin.

This series may appeal to readers who enjoy quiet, emotionally devastating drama, philosophical takes on mortality, and bittersweet character-driven romance.