Oono didn't stay in the video games exactly because of "accumulated anger"—despite the frustrations of being one of the family's leaders. Rather, she wanted to relax due to those frustrations and also because, above all, she is human, and Haruo recognized her as such, not as a "rich little princess."
Yamai is different. Her refuge in video games is an attempt to alleviate the anger and guilt (as felt in the story's narration) from her parents' accident. Being an orphan isn't easy—even more so in a country with social prejudices like Japan.
I've already read the "Raw" versions of both chapters and I can say that both this one and the next are sensational. Yamai didn't have a similar story evolution to Miwa and Mirai. But she quickly learned from Hidaka to enjoy life (the final panels of this chapter where Yamai narrates this feeling are excellent).
I don't know if HSG-D ends after the championship (and then we'd be left wondering about the period when Hidaka and Oono met in the USA) or if it goes a little further.
But let's keep following it. It's always a pleasure to follow this story where the games are part of the protagonists' history and at the same time situate them in real time and space, with emotions we would experience in everyday life.