the "overhearing" thing happened in chapter 23 - I just went to check
about half of the entire manga was dedicated to weird sulking and avoidance and contrived side tours, just so these two people clearly into each other wouldn't talk for a hot minute
at least they managed now, but then it's another classic "sail into the sunset" right after the confession, as per tradition. Compared to the charm of maybe ~10 first chapters, this series really left kinda bad taste overall
