Unlock Sakura Shinguji on horseback:
Have a completed saved game from Sakura Taisen: Atsuki Chishio Ni on your memory card.
Unlock Erika’s Kobu F2:
Have a completed saved game from Sakura Taisen Monogatari on your memory card.
Unlock Ogami’s Kobu:
Successfully complete the game as Shinguji Sakura.