How do you get all the weapons in Sengoku basara 3 Aichi ah?

The first 4 weapons put the normal difficulty story through once is pretty much the same; 5, 6 hit the hard difficulty out; 7, 8 hit the ultimate out, 9, 10 (funny weapons) is also the ultimate out; 11th if you put the story through twice; 12th is to go through three times.

Normal and hard are the four key ones. If you can drive 2p, you should choose a stronger one to accompany Ichi to fight the Inquisition, let him fight the bosses, and let Ichi check the equipment dropped after the fight.