Tbh dont feel too bad for them, they are still young and have time to figure things out. Also it's really stupid to bet everything on that one job interview. Shit like this can always happen and it's not the end of the world.
Just saying dont feel too angsty, they have each other and family who still cares about them, thats more than a lot of people can say.
A diploma can help you get by in life but it's not a must have to find happiness and stability. I didn't finish my studies at university and struggled to find a job where I could keep a healthy mind. Eventually after a lot of different jobs and setbacks I found a place where I proved myself and made it pretty far and still climbing the latter, no one cares about my lack of studies anymore.
I know you should never compare yourself with others, everyone is different and deals with shit in their own way. Just because one could do it even with all the bullshit doesn't mean you can expect someone else to do it too.
As long as they don't give up and keep talking to each other they will be fine. I really like this story since you dont have that many Yuri mangas that are a little more down to earth.