I'm not gonna lie, I read the main series before the "side chapters" started, so I don't remember it to well, but it wasn't this dark am I right? Also the side could have been a complete new series
I'm the only one that gets a vibe like itsuki is dead and tied to his brother and that is why he doesn't want to move out of the house and also the father didn't acknowledge him at all?
I'm not gonna lie, I read the main series before the "side chapters" started, so I don't remember it to well, but it wasn't this dark am I right? Also the side could have been a complete new series
Correct. The main story is much lighter.