Bro this girl has no tact. Like come on. If she was just a little bit more intelligent she could easily get what she wants.
On one hand I find it cute how clear she is on her feelings but on the otherhand if this was reality it would be a major pain in the ass.
Oji-san isn't making it easier when he says stuff like he'll die before her lol. That's only gonna make her worry more.
Teacher is actually kinda cute too. And like any Japanese woman in manga finds these scenarios cute and the silent pressure basically saying "You better stay single for this girl specifically. You are trapped by young love. You wouldn't want to be a piece of shit and break her heart would you?"