Is the story officially finished? To start reading

Yes, only side stories left

The other person must've misunderstood sth bc there is still a third season coming, I don't know when but the author clearly said it'll be there in the authors note of season 2

FRO IS LYING THERES GONNA BE ANOTHER SEASON CALLED THE KIHOON QUEST (no spoilers). NOT A SIDE STORY, ANOTHER FULL SEASON. SECOND SEASON FINALE LEFT OFF ON A CLIFFHANGER. OBAKE-CHAN, WAITTTTTTT, OBAKE-CHANNNNNNNNN