Former student x former teacher + space cat!? A slightly strange cohabitation life.

Imaji, a former student and photographer, comes to the house of former high school teacher Hozutsumi. They have sex, but aren't lovers; it is an ambiguous relationship. One day, Imaji picked up a cat. The cat, named San, speaks. What’s more, it tears your clothes with a mysterious force?? Imaji gets to know San and decides to live with him, despite Hozutsumi being confused when he is told that the cat came from outer space!?

“I hope I can be a source of comfort for Sensei.” "Don't call me sensei." What is the emotional scar that Hozutsumi feels as he is unable to enter into a deep relationship with Imaji?

(Source: Printemps Shuppan, fan translated)