Does Kanon's sisters boyfriend ever appear again after the jail scene? I want his coat.
Also by the way Kanon's grave appears just after a certain amount of time has passed after his death, not necessarily after the second attack. Though it will probably definitely have appeared by the time you get to the second attack.
No, I haven't run into him again after she runs off to the Goblin camp. His corpse doesn't show up, and he's not at the camp when everyone's packing up, so it's unclear where he ends up.
