Tears and glompings in 3...2...
You can tell that even though the artist's depictions of the characters are inconsistent he at least tries.

Shit I got dusts in my eyes..

Dammit, I need to clean my room..

Dammit..

Marking this translated. If someone wants to, they can copy the notes from previous translations for the flashbacks.

What is the onomatopoeia on the 4th panel?

Ran fainted or started crying profusely

Krugger said:
Ran fainted or started crying profusely

...or is ready to commit suicide

oh sob sob T.T

Cort321 said:
...or is ready to commit suicide

True can't rule that out, but I don't think she would try that infront of Chen after all she put her though. Just in case Yukari and Youmu are there

kraken said:
What is the onomatopoeia on the 4th panel?

It's a snapping sound, likely metaphorical—that is, something in Ran's mind snapping.

kraken said:

What is the onomatopoeia on the 4th panel?

I see "Zawa"
a rustle or a shift

Tsuchino said:

I see "Zawa"
a rustle or a shift

Oops—you're right. For some reason, I was thinking panel 6 is panel 4. Anyway, that's often used as a substitute for vague noise, as of talking in the background. Here, though, it can represent emotional disturbance.