So yes I finished the story, it was meant to be small so I like how it turned out.

-"Why did you do this to Giyuu?"

I can't make Douma the villain since it's too cliche, but I also didnt want Douma to be on the good side so he is like this. 

-"Does this mean Giyuu doesn't like Shinobu and he is gonna kill her?" 

Nope Giyuu never planned to kill her, he loves Shinobu very much

-"Who is the enemy?"

Eren Yeager

-"What was Kanae actually?"

Kanae was a leader of a mafia team who killed many people, she never told Shinobu and used to work at night, that's why she was on the couch, and she would always tell her to sleep so Shinobu wont find out any shit. 

-"What happens to Shinobu now?" 

Shinobu forgets about her revenge to have a family with Giyuu 

"Does this mean Giyuu is the antagonist?" 

I don't know, he only did his job.

"WHERE ARE THE OTHER CHARACTERS?"

In my basement, they were useless for this story 

"Why is this rushed?"

Tbh I don't know