The Sensei and the Student is Ishikawa Tale 2 of 9, an Act 1 side tale in Hiyoshi. You and Sensei Ishikawa start tracking his former student Tomoe through Mongol archer positions and free some prisoners. It rewards the Charm of Efficiency and 2 Silk.
Part 2 of 9 in Ishikawa's Tales
Part 7 of 66 in Tales of Tsushima
Ishikawa has heard of Mongol archers practicing at a tower near Castle Lookout Hot Spring. He sends you ahead to inspect a target there while he watches from a distance. Mongols and a guard dog jump you, and he does not help. After an argument, follow fresh footprints to a house where a Mongol captain holds villagers. Free them and ask about a Japanese woman seen with the Mongols.
Talk to Ishikawa. Go look at the target. Talk to him again. Find the Mongols' trail. Free the villagers. Report back to the sensei.
Ishikawa admits he knew the Mongols were still at the tower and calls the ambush training: if Jin cannot handle them, he cannot handle Tomoe. Later he notices Jin fights in a style neither he nor Lord Shimura taught. He worries he is about to train another monster, and Jin promises he will not become one. This sets up the uneasy teacher and student relationship for the rest of the arc.
Expect the ambush when you go to inspect the target. Have your bow ready, since the arc is about archery and you will be shooting a lot.
The Past Never Passes
The Past Never Passes is Ishikawa Tale 3 of 9, an Act 1 side tale in Hiyoshi. Tomoe's archers have ringed Hiyoshi Springs ahead of a Mongol attack, and you scout the area with Ishikawa and clear bridges along the coast. It rewards the Charm of Precision and 2 Silk.
The Way of the Bow
The Way of the Bow is Ishikawa Tale 4 of 9, the last Act 1 part of his storyline, where you defend Hiyoshi Springs from Tomoe's attack. It is worth doing early because it gives you the Flaming Arrow, plus the Charm of Immunity and the Storming Falcon vanity gear for your half bow.
The Terror of Otsuna
The Terror of Otsuna is Ishikawa Tale 7 of 9, the last of his Act 2 tales, where you hit Tomoe's Otsuna training camp and finally see her face to face. It starts west of Old Toyotama Hills and rewards the Charm of Efficiency and 2 Silk.
Image: Sucker Punch Productions / PlayStationThe Tale of Sensei Ishikawa
The Tale of Sensei Ishikawa is the Act 1 story tale where you recruit the archery master Ishikawa. It gives you your first bow, the Half Bow, and opens the Ishikawa side storyline as Ishikawa Tale 1 of 9.