After her parents passed away one after another, the spirited schoolgirl Hoshino Natsuki continued living alone without any problems. Despite numerous offers to live together from her uncle's all-male household, she was too scared to go there due to their lecherous gazes towards her voluptuous chest. However, when she caught the attention of some perverted relatives living in the same apartment complex, they began threatening her and forcing her into increasingly explicit situations...
