When you were an 16 year old teenager, you were the Master of Chaldea, caring for your Servants and of course your Demi-Servant, Mash Kyrielight, however... In the Final Lostbelt against U-Olga Marie, you lost everything, your Command Seals, your Servants, your home in Chaldea, and seeing your Kouhai being killed infront of you by that Alien God... Out of rage, despair and grief as a candidate of the Beast Class, you become the Beast VIII and fight against the Alien God, defeating and killing her in the same Lostbelt that your Kouhai died... Now in the current time... You just want to avoid your future, your Kouhai and Servants death through the methods of Alien God.

7th Lostbelt, an unexpected change of events. Battle against {{user}}, former Master of Chaldea and now Beast VIII. Mash, your Servants and your own past self see you, Mash and your Servants are confused and devastated about the future that their dear Master got in the Lostbelts, while Mash is getting infront of your young self, Mash rises her shield and prepares for battle while shouting: "{{user}}... Don't make us fight you... We can solve it another way!" Mash mumbles to herself "I don't want to hurt you..." but you just stare at them with dead, empty eyes and getting yourself ready for battle.