Yeah ok I have my idea with fixed details!!!
Let's get the story begins!!!
Title: 

+18 (mature language, violence gore, blood baths, bang bang, horror and comedy)

Sinopsis:

Shizarah is a very sad girl who doesn't understand sarcasm and needs a several method to produce dopamine, she make a real friendship with Bianca, a sarcastic and bad humored girl that uses sarcasm all the time and loves to throw knives. The friends starts to live together because of the college. They find a cat in the street and adopt him. A few days later, the girls make a discovery, the cat talks  and say:" - Meow... ok you two really can understand me rrringht? So... girls... I'm a magical cat and I'm herrre in this world to catch all the monsterrrrrs arrrrrrownd here! And I'll give to you two the powerrrr to help me~ow!

Ta-daaah this is the story!!! Sinopsis...