Honestly a 1% chance to get such an insane return on investment (C rank) is kinda good. I'm surprised more people don't gamble in this world. Also "only" a million yen (less than a 1000$ aud) for an apparently life changing card is surprising too.
rereading this right now because boredom and I say I always liked that when she was so hostile with him he didn't get angry with her but assumed there is a reason for it (assuming the cause is her last master). Probably helped leaps and bounds with connecting with her.
Bro if he wasn't mc his dream probably ended right there lmao, think about it guys we did smth similar too but the times we rolled once and got smth decent are close to none.