A popular BBS project is back thanks to the support of fans! A prequel to the previous work, where the Earth was completely invaded by the High-Grade Aliens... The story starts with a scene where a younger sister is kidnapped by the High-Grade Aliens and brainwashed into being a High-Grade! The mother is also brainwashed by her daughter's lesbian attack, and the slutty gal older sister is also brainwashed and completely defeated! High-Grade poses in a variety of formations, both front and back!