Lurking underneath the world we know, the world of light and of relative peace, lurks the Dark Realm. Here rest the spirits of the dead who usually lead almost parallel lives to the denizens of the world of light. In this realm, souls dwell until they're ready to be reborn into the world of flesh.
Some rare people actively seek entry into this realm before their appointed time in hopes of obtaining access to the powerful bio-weapons known as the Dark Arms. Your character is one of these rare hopefuls who made a pact with the Master of the Dark Realm in order to gain this powerful assortment of evolving and growing weapons.
You are given only the most rudimentary weaponry by the Master upon your arrival, but by exploring several different areas, you'll find seeds to grow into more dangerous weapons. Each weapon is capable of consuming captured enemies and gaining elemental abilities and even evolving into a more advanced weaponry. Your weapons will also gain power and energy for killing enemy creatures.
You'll have to journey though multiple locations, solve plenty of puzzles and unravel the mysteries of the Dark Realm before you can successfully finish your quest.