What Happened to Baki's Girlfriend in 'Baki Hanma'?

Netflix's 'Baki Hanma' anime lets us know the main character has a girlfriend, but then she disappears from the series. What happened?

Baki Hanma Heroes+BreezeWiki

what happened to baki's girlfriend?? : r/Grapplerbaki

what happened to baki gf｜TikTok Search

Kozue Matsumoto, The United Organization Toons Heroes Wiki

Baki the Grappler (TV Series 2001–2007) - IMDb

Baki Hamna, Wiki

Baki Hanma Season 2 part 2 dropped on Netflix today

What Happened to Baki's Girlfriend in 'Baki Hanma'? Explained

BAKI Multi Audio Clip: (NSFW) Yujiro Gives Baki a Lesson while He's in Bed with His Girlfriend