Blue Files: Travel Through Time and Become Hoshino-Chan's Sister

[Semi-invincible+casual+two-dimensional+daily+Hoshino] Xingchun accidentally came to Kivotos and became Hoshino-chan's sister when she was still in the second grade of Laomeng. She decided to change everything that happened in the past... Try to change the desertification, pay off the loan, and regain Abydos! Faced with the undercurrent of Kivotos, how should Xingchun solve it? [Xingshun] "Hoshino-chan, call me, sister, come and listen." [Hoshino] "Ha, let me call you sister, you are overthinking it." [Dream] "Hey, hey, actually I also want to hear sister Hoshino call me sister." [Hoshino] "..." The pace may be a bit slow in the early stages, but it will get better later on. Note: This book is an imaginary world, and the characters in the book are all adults.