After many years of constant resets and losing the loved ones of his life, Sans finally breaks down even after Frisk promises a brighter future. His actions soon cause the arrival of a mysterious train and upon entering it, he's whisked off to an unfamiliar location on what appears to be an endless array of train cars and discovers a glowing green number on his hand. With the help of the 20 year old girl named Alicia and many other mystical creatures and unusual beings, will Sans be able to uncover the mysteries and come to terms with his new life?