Well uh, you sure have a lot of your plate, TL-san.
10th -> 10x [Really, I needed 10 times the amount?]
Jintarou thing -> definitely an idiom for confusion/frustration of some sort
if they were -> I'm guessing it's something like "But they on the other hand...." or "But those two...."
tsukinotea -> Definitely some kind of name for the world of couples, and wanting to destroy that "fantasy"
sei -> Just a sound people make when they do a chop or punch