It mainly tells the story of a 16-year-old girl named Baiqian Xiangyang whose parents died in an accident. On her birthday, she received a suicide note containing a legacy left by her parents - a mansion located in the deep mountains and old forests. Himari, who thought she was about to live in a large and luxurious house, happily packed her bags, but when she traveled through mountains and rivers to get there, she found that the whole house was in tatters like a haunted house, and she was scared half to death by a naked man who suddenly appeared as soon as she entered the door... This man named Nanamori Aoi and his two friends named Zi and Ise not only lived here without permission, but also mysteriously told Xiangyang not to get close to the house, but was rejected on the spot by Xiangyang. Afterwards, she found that these three people had no ability to take care of themselves and often caused damage, but what gave her the most headache was not these, but her accidental discovery that these three people did not seem to be human...