Eight Limbs by Stephanie Phillips and Giulia Lalli

[Hypo]

Joanna, a retired Muay Thai champion, takes in a troubled foster teen and decides to train her, until the teen finds herself entangled with a dangerous group of criminals running underground fights and Joanna must return to the ring to save her... and keep their new family together.

After the devastating loss of her Muay Thai championship title, Joanna decided to walk away from competition, start a family, and open her own gym. But her quiet life gets disrupted when an old friend asks her to temporarily foster a troubled teen. Just as Joanna believes she is starting to break through Mari's walls, a misunderstanding drives Mari to run away and join an underground fighting ring. Joanna vows to do anything to get Mari back, even if that means stepping back into the ring...

[Hypo]

It's an OGN, preview.