Ghosts in the Fog is Norio Tale 3 of 9, an Act 2 side tale where you defend Akashima Village from a Mongol counterattack using incense burners as traps. It rewards the Charm of Unyielding II, the Noble Fighter's headband and 2 Silk.
Part 3 of 9 in Norio's Tales
Part 9 of 66 in Tales of Tsushima
With Hochi freed, Norio expects the Mongols to strike back at Akashima Village. Climb onto a rooftop in the village center to get a view, then talk the plan through with Norio. Go round the village setting up the incense burners. Find a hiding spot, wait for the Mongols to arrive and light the burners to fill the streets with smoke as you attack. Then rush to the temple to help Norio.
Meet Norio in Akashima Village. Climb a rooftop in the middle of the village and talk to him. Set up the incense burners. Hide and wait. Light the burners and beat the Mongols. Run to the temple, help Norio, and talk to him.
The village holds, but Hochi is killed stepping in front of a blow meant for Norio. Jin urges Norio to keep going, and Norio heads north to Kushi Temple.
The Last Warrior Monk
The Last Warrior Monk is Norio Tale 1 of 9, the Act 2 side tale that opens his storyline at Akashima Village. You help Norio track down monks the Mongols abducted from the village. It needs A New Horizon done and rewards the Charm of Resistance II and 2 Silk.
Three Actions, Three Illusions
Three Actions, Three Illusions is Norio Tale 2 of 9, an Act 2 side tale in Akashima where you rescue the healer-monk Hochi from a Mongol camp. It starts at Akashima Village and rewards the Charm of Vitality and 2 Silk.
The Birth of Suffering
The Birth of Suffering is Norio Tale 4 of 9, a short Act 2 side tale where you arrive at Kushi Temple to find it under Mongol attack. It is one straight fight alongside Norio and the temple monks, and it only rewards a minor Legend increase.
The Blood Sutra
The Blood Sutra is Norio Tale 5 of 9, an Act 2 side tale where you search for Kushi Temple's missing abbot. The trail runs from Koshimizu Farmstead to a waterfall. It rewards the Charm of Resistance II and 2 Silk.