Timeless Assassin - Chapter 48: Choosing the right meditation manual

After dying in an oddly anticlimactic vending machine accident, Kazuki Ren is reincarnated in the demon realm—not as a hero, not as a villain, but as the only human male student enrolled at the mysterious Academy of Ruin, a school where all the professors are demon lords and all the students are powerful, beautiful she-demons.Ren is told he has one task: survive.But there’s a catch. The Academy’s darkest secret is about to awaken, and Ren holds a hidden power that could either destroy the demon world... or rule it.Now surrounded by seductive demons with hidden motives, eldritch tomes, forbidden dungeons, and twisted exams, Ren must master his ability—or be consumed.Magic, mystery, danger, and temptation await in this dark academia harem fantasy.

This is a story of Xia An, a transmigrator from the end of the world, who transmigrates into the body of a cannon fodder who was the mother of the villain.

- Description from Wattpad

After getting hit by a truck meant for someone else, Nico is compensated by transmigrating into the body of the illegitimate and only son of billionaire, Logan Voss.To keep this new life, he's given a single mission. Climb over his seven step sisters and inherit his father's wealth.So, why in the heavens does this involve collecting the stamps of 99 different ladies?[Ding! 10x cashback system activated.][Ding! Stamp holder detected.][Collect stamp to gain 10 times the stamp holder's wealth.]“Fun isn't something one considers when trying to save his own life. But this does put a smile on my face.”