Their Muted Howls by Clara Hartley

Ren wants to keep me in his cage.
I’m not the girl who used to play with him.
I’ve grown from being the person who was content following his every word, living in his shadow. I’ve changed and have found three beautiful mates I need to protect.
Sawyer is in danger.
Carter will lose himself to rage.
And Nicholas has to face his greatest fear.
I’m back in Japan, the place I never wanted to call home. Betrayed by my best friend, he wishes to chain me to these lands.
This is a romance featuring one girl and multiple males. No choosing necessary. It contains some hints of M/M which will escalate in future books, some gore, and is a medium to high burn.