The prototype of the protagonist is a Tibetan mastiff on the snowy peak. He was once the king of mastiffs, but was expelled due to the failure of the soul transfer (referring to the setting).
The mastiff Calipe traveled back from the future when "the doctor died in front of him because he was not strong enough" and lost his past memories. He only remembered that he had to work hard to become stronger in order to protect him.
Do it again and I will never lose you.
"My name is Callipe, which means 'goodbye' in my hometown..."
Later, the ending came, and the mastiff finally died due to ore disease. The doctor still couldn't remember everything, but he felt that this was what the mastiff wanted.
Mastiff doesn't want the doctor to recall everything before he lost his memory, so that he won't feel guilty for not taking him away in the first place.
I at least protected you in the end, didn't I, Doctor?
Purpose: Let him understand that there are more people around him to accompany him