Have to be quick for this one and make sure you've done everything else before mission 4, because you need to personally defeat both Kai and Hayakawa, who will trigger the rare weapon mission upon defeating either one of them

Stage: Battle of Oshi Castle

Time Limit: 10 Minutes

Health Maintained: 50%

Kills: 700

Officer Kills: Lady Hayakawa and Kai

Allies Defeated: No More than 2

Rare Weapon Mission:
5. The Lion of Sagami Emerges
Prevent Ujiyasu Hojo from reaching the Oshi Castle Main Keep!

Missions:
1. Water Attack Preparation
Escort Tadaoki Hosokawa and Yoshiaki Kato to the South Western Garrison!
2. Protect the Levee - 1
Defeat Izuminokami Shibazaki, Yasunaga Matsuda and Yasusato Matsuda!
3. Protect the Levee - 2
Defeat Yukie Sakamaki!
4. Ladies Together
Prevent Kai and Lady Hayakawa from Rendezvousing!

Bonus Missions:
6. Fuma's Secret Maneuvers
Prevent Ninja Masters and Yukie Sakamaki from Rendezvousing!
7. Relief Efforts - 1
Defeat Tanbanokami Masaki and Yoshitake Mibu, and prevent Yoshinobu Satake from being defeated!
8. Relief Efforts - 2
Defeat Masayo Ito and Naoshige Chiba, and prevent Hideie Ukita from being defeated!

KEY
Battle: Self Explanatory "( )" indicate it has to be a certain version of the stage
Time Limit: The time Limit for you to fulfill the requirements, not for the rare weapon mission to spawn
Health: Amount of health you have to maintain throughout the acquisition of the weapon (You can let it drop after you get it)
Allied Officer Health Maintained: Sometimes allied officers have to have maintained a certain amount of health (Kunoichi's weapon for example)
Kills: Amount of kills you need before the Rare weapon Mission
Officer Kills: Officers the Character (who’s weapon you’re trying to get) has to personally defeat
Allies: amount of allied generals allowed to be defeated/ killed/ routed whatever
Rare Weapon Mission: The mission that the weapon is a reward for, complete it to obtain it (Providing you’ve done everything successfully)
Missions: Main missions in the battle you have to complete (Sometimes just your primary character)
Bonus Missions: Missions you’ll find hidden in the battle (Usually after someone says something)

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