余命18億秒の俺が死神と交わしたヤバい契約について (Associated Names)

Unfortunately, you only 1.8 billion seconds left to live. Please live a meaningful life. According to the Shinigami, I have 1.8 billion seconds left to live, and my childhood friend is going to die today. “The time we have spent together, it is all going to waste.” To lose the meaning of life, to lose…