These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Adaptation Displacement: In other parts of the world there are a few people that are genuinely surprised that this three part OVA is based off a game series. This is because it was the only part of the Variable Geo franchise to leave Japan.
Never Live It Down/Old Shame: Kaori hasn't forgotten the humiliation she suffered when she lost to Reimi, during the finals of the previous tournament. Since the finals is a default level-1 match, Kaori had to strip and masturbate in the arena, while Reimi watched. She's improved since then and re-enters VG with the intent to settle the score.
Instead, Reimi winds up facing off against the cyber drive enhanced Satomi, in an unsanctioned match. Just as she's on the cusp of victory Miranda activates the seed she implanted in Reimi's body, which binds her and saps her strength. Since she could no longer fight, Reimi gets eliminated from the competition, and Satomi is ruled the winner by default. Thus, she ends up being the one to face Yuka, in the final match.
The Other Darrin: All of the voice actors from the games were recast for the OVA.
The Woobie: The world of V.G. isn't always a happy one...
Erina seems happy-go-lucky, on the surface, but the glimpses we're allowed to see of her childhood shows she was bullied due to her natural blonde hair color. She eventually lashed out at her tormentors by beating them within an inch of their lives, and turned to juvenile delinquency. She seemingly grew out of it, years later, but her match with Yuka revealed those feelings of anger and resentment were still there.
The truth concerning Reimi's childhood is covered by the Abusive Parents entry on the character sheet, in her example section. Suffice to say, her upbringing has hardened her into both a Stoic Woobie and an Iron Lady.
There's also the girl Kaori fought in her first match. We never learn her name, but one has to wonder what circumstances drove her to try to fight an opponent she clearly had no chance of defeating. Not only was she publicly humiliated by being taken out by Kaori's opening attack, the look in her eye when she realized she had to pay the penalty for losing at level-1, further elicits audience sympathy.