Start the simulation to kill bugs and live to the peak of life
The real title of the book was [Start simulation to kill bugs, hide until you leave the moving castle](Lord's text)
When he woke up, the entire world had transmigrated to another world.
Other people would start off by doing quests in the main city or killing monsters in the wild to level up and pick up treasure chests, but Mu Fan had transmigrated to the Cursed Land and faced layers upon layers of undead army.
Other people's initial rewards were angels, black dragons, spearmen, elves, or even peasants, but Mu Fan only had a simulator.
From then on, Mu Fan started his life simulation:
A day later, while the others were still doing quests and killing monsters, Mu Fan had already gotten rid of the bug and escaped from the Legendary building, Moving Castle.
A week later, when other people started to build their territories and recruit mercenaries, Mu Fan had already become the City Lord and issued NPC missions. He had also become a grand mage and possessed Mythical Grade equipment. He had occupied a top-notch Dao Foundation Nest and had tens of thousands of undead under him. Moreover, the more he fought, the more undead he had.
A month later, when the others were fully fledged and formed teams to attack the city, Mu Fan had already conquered the entire Cursed Land and became the overlord of a region.
A year later, when the Immortal Cultivation World broke through the World Barrier and arrived on this mainland, others were still others. Mu Fan had already become the ruler of the mainland and had mastered the 3,000 Great Dao.
A concentration camp of imagination!
I feel like the story would be better if he was older or born in a different era like the real rihan. Then you still want to have the older sister relationship with satsuna too. sure tsurara might not be around but, she could be his and her daughter or something else. It would've given you more time to have trained. it would have given you more time to worldbuild it would have done so much if he was older of born in a different era like the real rihan. Heck I think the real yasaka could be about the same age as the real rihan. she could have been a friend. I just feel like you ruined your story having him be older. If you really wanted this just be the original character rikuo or don't have him be nurarihyon's kid