Junior Sister, Put Down the Knife First and Listen to My Explanation!

[Multiple heroines + plot + Shura field + system + yandere development] [There are too many elements in the book, so I won't go into details. The introduction is weak, so please move to the main text~] [It's a bit slow, please read patiently] Lu Ming accidentally traveled to the world of immortality and was accepted by a beautiful master. After practicing for a few years, he suddenly had a little junior sister who followed him all day long. She was very young and didn't know much about the world, so she ran to Lu Ming's house every day. Even after she turned eighteen, she was still like this, but her former love and respect for her senior brother began to deteriorate quietly... In addition to his junior sister, Lu Ming also has a senior sister who has an eccentric and unpredictable temperament. The senior sister is good at music, but often plays the piano very slowly. If it gets late, she will try to persuade him to stay and leave later. Lu Ming's talent was so poor that his junior sister's cultivation level was even higher than his. Fortunately, the system was awakened, although this thing came more than twenty years later... Just when Lu Ming thought he could reach the road to immortality and be free from the world, He gradually discovered that this awakening system seemed a bit unfair... Weird tasks are always issued for no reason. Lu Ming, who had pondered for a long time, could only accept it with tears in his eyes. But for Lu Ming now, these are not really important. The point is, junior sister - can we have a good talk first, for example... Put down the knife? The cold touch of the sword came on his neck. Lu Ming said he was very panicked!