They assume that there's no magic to enhance their hearing? Or prevent it from being sonic-bombed? Or to bypass silence magic? Or to hide in the shadows for recon? C'mon gramps, put a little imagination.
The brother is pretty wild too. He caught on the mechanism of blood cell production and made deductions based on his knowledge that was newly instilled not 15 minutes ago.
That... didn't resolve Gojo's conflict at all. Marin c'mon there's some issues to be talked out proper before you skip ahead into- oh nevermind... Just make sure to use protection and properly communicate your worries later I guess.
There are european plum variants called Mirabelle and Victoria plums, but in this case I think naming it Ume for specifically a japanese plum is perfect.