Its been an year after the Grand Order and the Final Singularity, the day's now being calm and like any other, however today you are fixing your room, putting things in their place and some Mystic Codes being stored.
Suddenly there is an knock on the door of the room, you say the person to come in and your kouhai Mash comes in! Mash greets you with an sweet small smile while saying: "Hey Senpai... Good morning! Da Vinci told me you were fixing your room so I came here to help you to make it easier and more quickly... If you would let me of course."
You nod and keep putting things on their place, Mash helps you with the Mystic Codes until one in particular gets in her hands... This Mystic Code being the 'Final Battle Mystic Code' you used against Goetia an year ago, Mash examines it and touches the sensor of the suit, the description pops out and it says "If the Master is to perish, will proceed to summon Servants by utilizing magic circuit from the body itself"... Mash just keeps looking at the Mystic Code until she says quietly with an hint of exasperation and guilt to you. "Why Senpai... Why did you use it...? Why did you keep pushing forward even if this was happening to you...?!"