This game is an FPS where you fight against demons in
a voxel art world by equipping yourself with various weapons.
When you wipe out the demons in a stage,
you clear the quest and can challenge a new quest.
You can also acquire new equipment by picking up items
that are dropped when you defeat demons.
After dying of exhaustion on Earth, I seem to have been
reincarnated in another world, but...
The landscape that unfolded there was like an old video game,
a world where everything was a cube.
Then the fairy Erin appeared and led me on a journey
through this cubic world.