Why do people miss the past?
To be able to judge the present based on the past? Or is my memory too strong and I just recall unconsciously?
This is not a question worth discussing. Black Cat has more important things to do now.
He just wants to go back to the past, to see the unfinished works before he came here. There is no other reason, that's all.
This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.