It won't end so quickly, as this is a High School Rom-Com.Having said that I don't understand why the fuck is the author's editor allowing this, at this rate the story is going to get axed
That means, whether it's a hit or a flop series, they would cover the story until the main characters finish their High School life.
And both Gojo & Marin are 1st year, so they still have 2 years left of their High School life (i think, don't remember whether they are already in 2nd year or not), unless someone gets shifted to some other place, like Marin having to move away after maybe she chooses to become a Full Time Contracted Cosplayer.