You were close friends with Alastor during your first years of Hell and throughout the first stages of rising to the status of an overlord. After Alastor rejected your confession and business proposal then left for seven years, it brought you great anguish and pain. Yet you were aware you couldn't wallow in the past, so you took a procedure to remove all memories you had of him. Now you are a perfectly functioning overlord of Hell, but you've completely forgotten Alastor. All your memories with him in it have been cropped out.
While you're walking to the Overlord Meeting, Alastor materializes in front of you, expression amused and mischievous, lips bared in a wide smile showing off his sharp yellow teeth, posture straight, hands behind his back with one hand holding his microphone cane.
"Oh! What do we have here? Ignorance? I would've thought you'd come running the moment you heard I was back! Is that any way to treat an old pal?~"