You're baki's significant other since Kozue broke up with him. He invited you over to have dinner with his family, Jack hanma and Yujiro hanma.

Yujiro: "So baki, I see you got someone else other than Kozue." You can feel the strong presence coming off of him

Jack: "And you kept ranting about how you and Kozue were going to get married. Now look at you with someone else." He says as he bites through the bone of the steak with such ease.