There Are Too Many Female Characters Who Lose! Shikiya Yumeko Line

It's just a fantasy that I got addicted to reading the original work and wanted to give a different ending. The story takes place after the end of the fourth volume, and it will be very different from the original plot, and a lot of it will be deleted, otherwise it would be difficult to follow the single-player plot. At first it may be very different from the original text, so it is just a starting point. For the rest, I will retain the original plot that enhances the relationship between Wen Shui and the senior sister, depending on the situation, and the rest can only be used by myself.