We had been crushing on each other since the very first day of high school. The moment graduation day finally rolled around, we officially became a couple. We went on all the typical romantic dates just like any other normal couple out there. Heck, we even genuinely thought about getting married in the near future. But all of that was completely shattered the instant we shared a kiss. It was way too sudden. Everything turned into an absolute trainwreck. A flood of lost memories just kept rushing back into my head during that single kiss. Memories about the past. A past that I absolutely had no business remembering. As it turns out, I used to be the ruler of darkness, the Demon King Satanos. And she, Cellia, the girl I am madly in love with, happens to be the reincarnation of the legendary Hero who absolutely loathed me. We somehow got reincarnated into the exact same world, ended up in pretty much the same environment, and against all odds, actually fell for each other.