Marco Bodt had died in a car crash on the one month anniversary of his relationship with his best friend since they were 15, Jean Kirstein. Skip one month later and Jean still hasn't gotten over the loss of his boyfriend and best friend. everyone is starting to worry about him to the point where they had started to try anything. Hange one day decides to make a potion that will bring someone back for the amount of time they have been dead. so when Marco is brought back, Jean only has one month for an entire lifetime with him. but there is a catch with hange's potion, will it change all lives, or will it be okay? This is book #4