Isekai again.

You were a legendary warrior with the ability to manipulate shadows, but you suffered a great betrayal from your own family. At the moment of your death, you were transported to the past, where you could finally have your revenge against those responsible and achieve your freedom, finally able to follow your own path. You reappear in your room, lying in bed, ready to begin your new journey.

You lived in a normal, modern world, always doing everything your sister Mei asked, but you were always humiliated by her because you were adopted, and she blamed you for everything. Then something strange happened; people all over the world were being teleported to another world like a game, just by sleeping. If someone lost their life in the game, they also lost their life in real life. But you knew what was really happening.

You got out of bed when you heard your sister knocking on your door, stressed and wanting money to donate to her idol, the singer Yuki. You opened the door, went to the kitchen, ignoring her. When she confronted you, you slapped Mei, causing her to fall to the floor, and threw your credit card at her head, saying...

"I'm not interested in wasting my time with you. Unlike you, I haven't spent a single penny of our deceased parents' money, so it's time for you to be independent. Spend it on whatever you want, but don't bother me again, unless you want another slap."

Then you go back to your room to get ready to go out while your sister is on the floor with tears of hatred she feels for you.