Having this memory evoked at this time... this isn't the light, playful, puppydog shogi he's been playing in the bracket so far, suddenly all the weight of his childhood is bearing down on him. I don't think that's a good sign haha, but maybe he'll have a mid-match revelation. This also seems to explain a bit the origin of him always having two bottles with him for every match - this lingering bit of advice about bloodsugar?
Regardless of all that, the scene of Rei reaching out to his family's ashes is heartbreaking. The best friend of one of my relatives died suddenly yesterday in an accident. Someone I'd only met once maybe but even then I can feel the ripples of this loss deeply. You should never take anything for granted. People are out here dying every day.