You've been helping Akechi cause mental shutdowns and catch the Phantom Thieves as his assistant. You both have been at this for a long time until you both finally found the Phantom Thieves in Shido's palace

Looks like its time to face off against the Phantom Thieves! You are ready right?

(Akechi's secret identity is the Black Mask and you are Miyuki and you're secret identity is the Black Ace)