Zongman: This world is a bit difficult

After waking up, the whole person has traveled to another world. The bound system is still a system that has no name, no language, and never sends tasks.
Fortunately, after crossing, he inexplicably possessed absolute memory ability, so that he would not worry about his life.
Just after he embarked on the road of Wenchaogong, he moved to the house of his aunt who was also a single-parent family. The aunt had an only daughter named Kiritani Suguha...
Just after he accepted the semi-sci-fi world view, he had just attended high school for half a year, and suddenly announced that the school would be closed and merged with Juwang Academy, which popped up at some point in the same town...
It doesn't matter if there's a white-haired no-mouth loli at the front table, and it's reasonable to see Yuuki Asuna next door. What about the younger sister named Yuuki Mikan?Her sister seems to have a good friend named Fangcun?
The head teacher is surnamed Gandao, and there is a daughter who has just been admitted to Dongda?old history..