Gray-Haired Girl's Online-Bought Stand Goes on a Killing Spree in the Holy Grail War

Can you show me some other life paths? I feel like Master Xing was not very clear when he introduced himself. If someone who knows you well suddenly shows up with strong abilities and is an enemy, I will feel in trouble and a little afraid that I will not directly trust the other party or be a direct teammate. (Asymmetry of information/Possibility of lies/Being stabbed at any time) This is a war.

Not bad, looking forward to it