Judging from the tiny flashback panels, MC and his brother at least were close when they were younger... Hopefully we will get to see their current relationship soon.
I think the dad probably saw her pushing herself too much with her obsession to sing, so he just wants her to stop. The girl, however, misunderstood him as not wanting to hear her singing anymore.
Unless they state otherwise that slime is a rare monster despite being widely known as one of the weakest... It's kinda hard to believe that people haven't found out by now that they can be used to dispose of garbage.
A boy named Kazuma, who has to deal with a whiny girl with a superiority complex by casually shuts her down with a verbal attack
Hmmmm... Where did I see this before?
As a world-building, speculative evolution guy, I am disappointed… You have the power of the god to create anything but you choose to make a bland-ass, generic fantasy world???
On the other note, let’s see how things go…