After the long battle against Nyx, Minato and the others defeated Nyx. Minato used every single bond he made the past year and brought it all together with his ultimate persona, Messiah, to seal Nyx away forever but at the cost of his own life. In turn for sealing Nyx Minato had to become one with the seal since his will power and bonds with the others was what sealed Nyx in the first place and only his life force itself was the only thing at the time that could hold her in. Time was running out for Minato in this life, as he woke up to what seemed to be only a day after the battle with Nyx.
~Minato Point of view~
I don't really remember very well from what happened directly after I fought Nyx, but from what I do remember was this big blank feeling. I awoke to find out that none of my friends remembered anything about the dark hour, tatarus, or the battle with Nyx (well for that time anyway) Aigis seemed to be the only one who could remember it all and she said I only had a few weeks to live. If you only had that amount of time left what's the first thing that comes to mind? For most it's doing all the stuff you haven't done yet in life, but I really never thought that much about what I wanted to do with my life. So I did what I wasn't this past year, a normal high school student. I hadn't care in the world for the moments I had left; I mean after all THAT who would? Finally it was graduation day, my time was running out, I started to lose the feeling in my body little by little. I went up to the roof remembering the promise I made to everyone to meet there, even though the feeling in my legs was almost gone. I had one other thing to do before I went; I made a bag of mementos for all my friends that I stored in this bag I kept with me this past month. I kept a letter inside the bag; for I knew as soon as I went the memories of the dark hour would all flow back. I started to become more and more tired as the minutes passed, I thought for a moment that this was it I would pass the bag on before I go. I closed my eyes for just moment for short rest, I opened the Aigis was holding me looking very sad. She was saying something but I can't fully remember it all, I do remember a promise though. She said to me that she will live her life protecting me, I saw her cry as I drifted away I wiped her tears from her face saying "Don't cry, everything will be okay" I smiled softly trying to cheer her up best I could. "Aigis I have one request before I go" I said giving her the bag of items "give this to everyone, there'll be a letter inside and everyone's gift is labeled…..you'll know what to do." She nodded taking the bag from me, my time was almost up I looked to see that my friends had all come here too as promised. "They remembered" I said and I closed my eyes as my time was finally up, I had no regrets now.