Bury Ship Captain is a short unwritten tale on Iki Island's northern coast. You find the drowned captain who sailed you to Iki and give him a proper burial, which counts toward the Common Courtesy trophy.
Walk the north coast until you spot the captain's body washed up on shore. Interact with it and Jin buries him, noting he too died serving Tsushima.
Hachibee the Beekeeper
Hachibee the Beekeeper is a short unwritten tale in Old Gambler's Wood on Iki Island. Mongols are coming to wreck a beekeeper's home and hives, and you fight them off. It counts toward the Common Courtesy trophy.
Helping Kodama
Helping Kodama is a short unwritten tale east of Lake Nagata on Iki Island. A masked woman blames the samurai for scarring the land, and you clear Mongols cutting down a nearby forest. It counts toward the Common Courtesy trophy.
Raider Memorial Archery Challenge
Raider Memorial Archery Challenge is a short unwritten tale in southern Iki Island. Wear Tadayori's Armor in front of a raider groundskeeper and he dares you to shoot seven lanterns. Win and he gives you a charm.
Retelling Legends to Uta
Retelling Legends to Uta is a short unwritten tale east of Yahata Forest on Iki Island. A writer asks about a Legends mode story, and if you have finished Legends you can retell it to her for the White Kitsune mask.