I said it before, Yuusei is a professional Sumire wrangler.
He knows that he'd have better luck teaching car repair to a poodle than talking sense to Sumire.
But Yuusei, you're letting your love for potential Sumire blind you to actual Sumire. She needs an intervention, not coaching.
But it probably wouldn't work, and he knows that. Sumire's dopamine-fried, failure of a brain, is too dumb right now to acknowledge just how bad her situation really is.
Kudos to the boy however, he came up with a foolproof way to actually win at slots.
But foolproof is not the same as Sumireproof.