(Please set aside the original premise before reading. The author's setting takes precedence.)
[On the first day after transmigrating, I discovered that my stepsister was Kaguya Shinomiya. I thought this was an insanely lucky start, so I decided to coast through life.]
[On the second day, I heard my cheap father talking about some kind of arranged marriage. But as his adopted son, that wasn't something I needed to worry about.]
[On the third day, I was informed that I had an engagement. My fiancee's name was Shiki Ryougi. I started to feel that something was off, but since I'd scored a beautiful wife for free, I decided not to think about it.]
[On the fourth day, I saw a white-haired girl attacking passersby with a scythe while I was out shopping. But when I got home, there weren't any reports about it. I had a vague feeling that this world might not be so simple.]
[On the fifth day, I saw on the news that a spatial quake had struck the neighboring city. For a moment, I didn't know where to begin with my complaints.]
[On the sixth day, my three cheap older brothers suddenly dropped dead. I suddenly felt the malice of the world.]
[On the seventh day, I came to my senses and decided to survive in this world, but...]
Shinomiya Eiyoku stared silently for a moment at the Demon King System that had suddenly appeared in his mind, then picked up his pen and continued writing in his diary:
[But first, I'm going to go kidnap a beauty with a score of 90 in looks and make her my adjutant.]
