Not terrible, not amazing. Very uninspired. The hook was kinda weak, the characters so didn't have anything going on that the little sister had to become the third wheel for contrived drama midway through.
This should've probably gone back to the drawing board so there was more going on for all the characters involved and perhaps better relationship dynamics around the main couple's friends to have people to bounce off. It was so focused on him making his manga and them realising they liked each other that nothing else happened.
The banter or chemistry between them wasn't good enough to carry that very far. A deserved axe honestly, especially with all the plate juggling going on with their other series.