From Newtype site:

Our ages are different, our ways of life are different, everything is different. But… I just want to be with you!
Because I've never been in a miserable, tragic romance, I can say that unrequited love is fine…
I don't know why I fell in love with this person…it's a mystery!

They have different personalities, different ages, different ways of thinking, different looks, different everything.
This is the story of girls who clumsily make up for what's lacking in the other.

T/N:
These are side stories. Not a rewrite of the original serialized twitter comic. It builds up on what happens in the main series in a longer format. It eventually merges with the main series in the volume edition.

The kind of stories these are is all in the title!

不揃 (fuzoroi) means uneven, irregular, but also incomplete. 連理 (renri) is "entwined relationship".

So, these are stories of intimate relationships between "incomplete" girls that somehow complete each other, against all odds.