This is a modern Gauntlet clone with characters from the anime Sister Princess. The player advance on a 360° scrolling environment, constantly shooting in all directions, defeating the endless masses of foes (other sisters) coming from all directions. Complete with massive firepower and special attacks.
Release date is an educated guess.
Translated box back:
There's not just twelve of them!!
Bullet hell and little sisters, filling the whole screen!
Annihilate the swarm of enemies with chain reaction!
A wonderful action shooting game.