To get the rare weapon you need an overall "S" rank on the stage on hard.
Getting an S requires at least S grades on 3 of the battle objectives, as well as one A grade

Chapter: The Incident at Honnōji
Stage: Flight through Iga

Battle Ratings
Time: 9 Minutes
Damage Sustained by Wards*: 20%
Allied officers defeated: 0
Objectives completed: 4/4

*How much damage the allied commander or allied officers take

Partners Allowed: Any except Ieyasu (any version)

Hanzō Hattori
Weapon: Phantom Sickle
Stat 1: Attack 20
Stat 2: Death 10
Stat 3: Attack Speed 15
Stat 4: Ice 10

Horse: Matsukaze

Battle Accessories:
1: Demonspawn Mask (Rare - Location: Kimi Pass)
2: Conqueror's Saddle (Rare - Location: Komoro)
3: Golden Lion Armour (Rare - Location: Mt. Shigi)

Tadakatsu Honda
Weapon: Tiger Pike
Stat 1: Attack 20
Stat 2: Attack Speed 15
Stat 3: Ice 10
Stat 4: Death 10

Horse: Matsukaze

Battle Accessories:
1: Demonspawn Mask (Rare - Location: Kimi Pass)
2: Conqueror's Saddle (Rare - Location: Komoro)
3: Golden Lion Armour (Rare - Location: Mt. Shigi)

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