Unlock Magnum:
Complete the Final Mission to unlock the magnum.
Unlock Shotgun:
Achieve an S-Rank on all of the training missions to unlock the shotgun.

Fireworks training mode
Get the top score in story mode to unlock the Fireworks mini-game in training mode.

More credits
You can gain one additional credit, up to a maximum of twelve, if you lose all your credits in a chapter.

Mission mode Chapter 2
Successfully complete Guren's Chapter in story mode.

Mission mode Chapter 3
Successfully complete Gunjo's Chapter in story mode.

Mission mode Chapter 4
Successfully complete Aoi's Chapter in story mode.

Mission mode Chapter 5
Successfully complete story mode.

Mission mode Final Chapter
Successfully complete all chapters in mission mode