Probably, it's the story of Ersukezi's shell having a new core?
Reading notes:
1. This article is written by Mr. Jin, written by a primary school student. If you feel uncomfortable reading, please escape in the upper right corner.
2. Mysterious setting, look forward to suggestions, refuse to criticize
3. Cp undecided
4. I don't know where I can write, I can only read... Fate =v=