Tokyo: the Yandere Lady Stopped Me from Having a Harem

"She... Shiina Naon, from now on, is my fiancée, Chiyo Tokiha." "What did you say, Shi Wei!" "Brother! You really can't blame me." "Shi Wei, you'd better explain clearly, otherwise you will need to explain a lot more tonight." The beautiful girl humanoid system has the ability to travel through parallel worlds and has an infinite lifespan. The price is to help the person designated by the task to complete the goal! Of course, time travel is also determined by the mission, and if you complete the goal, you will be forcibly sent away. No one will remember you except the special one. Because of this system, Shi Wei traveled through time again and came to a strange world. But this is different from the past. The wrong location and the disappearance of the system all reveal something strange. Before going to the right destination, Shi Wei rejected the confession of his childhood sweetheart "Yi Yunshu" and went to Tokyo to study with his sister "Shi Li" who depended on each other for life. After arriving at the destination, a new identity was regained. His name was changed to "Chiyo Tokiha", his sister "Chiyo Yuka", and his childhood sweetheart "Shiina Naon". Nayin's crisis caused the "Source Core" to trigger...