In A Simple Life with My Unobtrusive Sister, you take on the role of a lone adventurer who delves deep into the dangerous Abyss in search of rare materials. Your goal is to craft the miraculous elixir known as the “Red Cerebrospinal Fluid”, the only cure for your sister’s fragile condition. But time is running out. If you fail to complete the elixir before the deadline, her life may be lost forever.