マジカル・シューター ルナ～銃と触手とスク水と～

"Hunt the monsters"
All they can remember is that phrase.
Two girls, Luna and Misa, have lost all other memory. They were searching for their memory while hunting for the monsters as told.
And finally, they got a clue; they arrived at an abandoned mansion in a remote area.
Luna recognized the mansion, and the two stepped inside the castle full of monsters...